Physics · JEE Main, NEET

Current Electricity

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282MCQ98Numerical162With diagram
Start with question 1 Revise Current Electricity firstSee it move: Circuit builder
  1. 1In the given electrical circuit network between terminals AA and BB, resistors are R1=4 ΩR_1 = 4\,\Omega, R2=8 ΩR_2 = 8\,\Omega, R3=6 ΩR_3 = 6\,\Omega, and R4=12 ΩR_4 = 12\,\Omega. Determine the equivalent resistance RABR_{AB}.JEE Main/MCQ/Medium/With diagram
  2. 2In the given meter bridge setup, null point is found at distance l=40 cml = 40\,\text{cm} from end AA. If the known standard resistor is S=6 ΩS = 6\,\Omega, the value of the unknown resistance RR in the left gap is:NEET/MCQ/Medium/With diagram
  3. 3A wire of resistance RR is stretched to double its original length keeping volume constant. Its new resistance is:NEET/MCQ/Medium
  4. 4In an experiment to determine the resistance of a given wire using Ohm's law, the voltmeter and ammeter readings are noted as 10 V10\text{ V} and 5 A5\text{ A}, respectively. The least counts of voltmeter and ammeter are 500 mV500\text{ mV} and 200 mA200\text{ mA}, respectively. The estimated error in the resistance measurement is _______ Ω\Omega.JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  5. 5Which one of the following is not a measurable quantity?JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  6. 6A cylindrical conductor of length 2 m and area of cross-section 0.2 mm20.2 \mathrm{~mm}^{2} carries an electric current of 1.6 A when its ends are connected to a 2 V battery. Mobility of electrons in the conductor is α×10−3 m2/V.s\alpha \times 10^{-3} \mathrm{~m}^{2} / V. s. The value of α\alpha is :
    (electron concentration     =5×1028/m3=5 \times 10^{28} / \mathrm{m}^{3} and electron charge =1.6×10−19C)\left.=1.6 \times 10^{-19} \mathrm{C}\right)    JEE Main/Numerical/Medium/Electric Current and Drift of Electrons
  7. 7Current passing through a wire as function of time is given as I(t)=0.02t+0.01 A\mathrm{I}(\mathrm{t})=0.02 \mathrm{t}+0.01 \mathrm{~A}. The charge that will flow through the wire from t=1st=1 s to t=2st=2 s is :JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  8. 8The current in a conductor is expressed as I=3t2+4t3I=3{t}^{2}+4{t}^{3}, where II is in Ampere and tt is in second. The amount of electric charge that flows through a section of the conductor during t=1st=1s to t=2st=2s is ____________ C.C.JEE Main/Numerical/Medium/Electric Current and Drift of Electrons
  9. 9The electric current through a wire varies with time as I=I0+βtI={I}_{0}+\beta t, where I0=20A{I}_{0}=20A and β=3As−1\beta =3A{s}^{-1}. The amount of electric charge crossed through a section of the wire in 20s20s is:JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  10. 10The current flowing through a conductor connected across a source is 2A2A and 1.2A1.2A at 0oC{0}^{o}C and 100oC{100}^{o}C respectively. The current flowing through the conductor at 50oC{50}^{o}C will be _____ ×102mA\times {10}^{2}mA.JEE Main/Numerical/Medium/Electric Current and Drift of Electrons
  11. 11In a metallic conductor, under the effect of applied electric field, the free electrons of the conductorJEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  12. 12The number density of free electrons in copper is nearly 8×1028m−38\times {10}^{28}{m}^{-3}. A copper wire has its area of cross-section =2×10−6m2=2\times {10}^{-6}{m}^{2} and is carrying a current of 3.2A3.2A. The drift speed of the electrons is _____×10−6ms−1\times {10}^{-6}m{s}^{-1}.JEE Main/Numerical/Medium/Electric Current and Drift of Electrons
  13. 13A current of 2A2A flows through a wire of cross-sectional area 25.0mm225.0{mm}^{2}. The number of free electrons in a cubic meter are 2.0×10282.0\times {10}^{28}. The drift velocity of the electrons is _____ ×10−6ms−1\times {10}^{-6}{ms}^{-1}
    (given, charge on electron     =1.6×10−19C=1.6\times {10}^{-19}C).    JEE Main/Numerical/Medium/Electric Current and Drift of Electrons
  14. 14The drift velocity of electrons for a conductor connected in an electrical circuit is Vd{V}_{d}. The conductor is now replaced by another conductor with same material and same length but double the area of cross-section. The applied voltage remains same. The new drift velocity of electrons will beJEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  15. 15The charge flowing in a conductor changes with time as Q(t)=αt−βt2+γt3Q\left(t\right)=\alpha t-\beta {t}^{2}+\gamma {t}^{3}, where α,β\alpha ,\beta and γ\gamma are constants. Minimum value of current is:JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  16. 16A. The drift velocity of electrons decreases with the increase in the temperature of conductor.
    B. The drift velocity is inversely proportional to the area of cross-section of given conductor.
    C. The drift velocity does not depend on the applied potential difference to the conductor.
    D. The drift velocity of electron is inversely proportional to the length of the conductor.
    E. The drift velocity increases with the increase in the temperature of conductor.
    Choose the correct answer from the options given below:    JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  17. 17For the network shown below, the value of VB−VA{V}_{B}-{V}_{A} is _____ VV.
    JEE Main/Numerical/Medium/Electric Current and Drift of Electrons/With diagram
  18. 18The current density in a cylindrical wire of radius r=4.0mmr=4.0mm is 1.0×106A2m21.0\times {10}^{6}{A}^{2}{m}^{2}. The current through the outer portion of the wire between radial distances r2\dfrac{r}{2} and rr is xπAx\pi A; where xx isJEE Main/Numerical/Medium/Electric Current and Drift of Electrons
  19. 19The current density in a cylindrical wire of radius 4mm4mm is 4×106Am−24\times {10}^{6}A{m}^{-2}. The current through the outer portion of the wire between radial distances R2\dfrac{R}{2} and RR is _____ πA\pi A.JEE Main/Numerical/Medium/Electric Current and Drift of Electrons
  20. 20The total current supplied to the circuit as shown in figure by the 5V5V battery is _____ AA.
    JEE Main/Numerical/Medium/Electric Current and Drift of Electrons/With diagram
  21. 21For the circuit shown, the value of current at time t=3.2st=3.2s will be ______ AA.

    [Voltage distribution     V(t)V(t) is shown by Fig. (1)(1) and the circuit is shown in Fig. (2)(2)]    JEE Main/Numerical/Medium/Electric Current and Drift of Electrons/With diagram
  22. 22A current of 5A5A is passing through a non-linear magnesium wire of cross-section 0.04m20.04{m}^{2}. At every point the direction of current density is at an angle of 60∘60^{\circ} with the unit vector of area of cross-section.
    The magnitude of electric field at every point of the conductor is: (resistivity of magnesium     ρ=44×10−8Ωm\rho =44\times {10}^{-8}\Omega m)    JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  23. 23The circuit shown in the figure consists of a charged capacitor of capacity 3μF3\mu F and a charge of 30μC.30\mu C. At time t=0,t=0, when the key is closed, the value of current flowing through the 5MΩ5M\Omega resistor is xμA.x\mu A. The value of xx to the nearest integer is
    JEE Main/Numerical/Medium/Electric Current and Drift of Electrons/With diagram
  24. 24In the experiment of Ohm's law, a potential difference of 5.0V5.0V is applied across the end of a conductor of length 10.0cm10.0cm and diameter of 5.00mm.5.00mm. The measured current in the conductor is 2.00A.2.00A. The maximum permissible percentage error in the resistivity of the conductor is :-JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  25. 25Seawater at a frequency f=9×102Hzf=9\times {10}^{2}Hz, has permittivity ϵ=80ϵ0\epsilon =80{\epsilon }_{0} and resistivity ρ=0.25Ωm\rho =0.25\Omega m. Imagine a parallel plate capacitor is immersed in seawater and is driven by an alternating voltage source V(t)=V0sin⁡(2πft)V(t)={V}_{0}\sin (2\pi ft). Then the conduction current density becomes 10x{10}^{x} times the displacement current density after time t=1800s.t=\dfrac{1}{800}s. The value of xx is _______
    (Given     :14πϵ0=9×109Nm2C−2)\left.:\dfrac{1}{4\pi {\epsilon }_{0}}=9\times {10}^{9}N{m}^{2}{C}^{-2}\right)    JEE Main/Numerical/Medium/Electric Current and Drift of Electrons
  26. 26A current of 10A10A exists in a wire of cross-sectional area of 5mm25{mm}^{2} with a drift velocity of 2×10−3ms−1.2\times {10}^{-3}{ms}^{-1}. The number of free electrons in each cubic meter of the wire isJEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  27. 27In the figure given, the electric current flowing through the 5kΩ5k\Omega resistor is xx mAmA.

    The value of     xx to the nearest integer is ________.    JEE Main/Numerical/Medium/Electric Current and Drift of Electrons/With diagram
  28. 28A cylindrical wire of radius 0.5mm0.5mm and conductivity 5×107Sm−15\times {10}^{7}S{m}^{-1} is subjected to an electric field of 10mVm−1.10mV{m}^{-1}. The expected value of current in the wire will be x3πmA.{x}^{3}\pi mA. The value of xx is _________.JEE Main/Numerical/Medium/Electric Current and Drift of Electrons
  29. 29A current through a wire depends on time as i=α0t+βt2i={\alpha }_{0}t+\beta {t}^{2}, where α0=20As−1{\alpha }_{0}=20A{s}^{-1} and β=8As−2\beta =8A{s}^{-2}. Find the charge crossed through a section of the wire in 15s.15s.JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  30. 30A current of 5A5A passes through a copper conductor (resistivity =1.7×10−8Ωm=1.7\times {10}^{-8}\Omega m ) of radius of cross-section 5mm5mm . Find the mobility of the charges if their drift velocity is 1.1×10−3ms−11.1\times {10}^{-3}{ms}^{-1} .JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  31. 31In a conductor, if the number of conduction electrons per unit volume is 8.5×1028m−38.5\times {10}^{28} {m}^{-3} and mean free time is 25fs25 fs (femto second), it’s approximate resistivity is: (me=9.1×10−31kg)\left({m}_{e}=9.1\times {10}^{-31} kg\right)JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  32. 32The charge on a capacitor plate in a circuit, as a function of time, is shown in the figure:



    What is the value of current at     t=4s?t=4s?    JEE Main/MCQ/Medium/Electric Current and Drift of Electrons/With diagram
  33. 33Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for an N\text{N}-type semiconductor, the density of electrons is 1019m−3{10}^{19}{m}^{-3} and their mobility is 1.6m2V−1s−11.6{m}^{2}{V}^{-1}{s}^{-1}, then the resistivity of the semiconductor (since it is an N\text{N}-type semiconductor contribution of holes is ignored) is close to:JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  34. 34Drift speed of electrons, when 1.5A1.5A current flows in a copper wire of cross section 5mm25{mm}^{2} is vd.{v}_{d}. If the electron density in copper is 9×1028m−39\times {10}^{28}{m}^{-3} the value of vd{v}_{d} in mms−1mm{s}^{-1} is close to (Take charge of an electron to be =1.6×10−19C=1.6\times {10}^{-19}C)JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  35. 35Suppose the drift velocity vd{v}_{d} in a material varied with the applied electric field E as vd∝E{v}_{d}\propto \sqrt{E}. Then V−IV-I graph for a wire made of such a material is best given by:JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  36. 36When 5V5V potential difference is applied across a wire of length 0.1m0.1m, the drift speed of electrons is 2.5×10−4ms−12.5\times {10}^{-4}m{s}^{-1} . If the electron density in the wire is 8×1028m−38\times {10}^{28}{m}^{-3} , the resistivity of the material is close to:JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  37. 37A generator has armature resistance of 0.1Ω0.1 \Omega and develops an induced emf of 120 V120 \mathrm{~V} when driven at its rated speed. Its terminal voltage when a current of 50 A50 \mathrm{~A} is being drawn isJEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  38. 38This question has Statement 1 and Statement 2. Of the four choices given after the Statements, choose the one that best describes the two Statements.
    Statement 1: The possibility of an electric bulb fusing is higher at the time of switching     ON\mathrm{ON}.
    Statement 2: Resistance of an electric bulb when it is not lit up is much smaller than when it is lit up.    JEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  39. 39Paragraph:
    Consider a block of conducting material of resistivity '     ρ\rho ' shown in the figure. Current 'l' enters at 'A' and leaves from ' D\mathrm{D} '. We apply superposition principle to find voltage ' ΔV\Delta \mathrm{V} ' developed between ' B\mathrm{B} ' and ' C\mathrm{C} '. The calculation is done in the following steps:
    (i) Take current 'l' entering from 'A' and assume it to spread over a hemispherical surface in the block.
    (ii) Calculate field     E(r)E(r) at distance ' rr ' from AA by using Ohm's law E=ρjE=\rho j, where jj is the current per unit area at ' rr '.
    (iii) From the '     rr ' dependence of E(r)E(r), obtain the potential V(r)V(r) at rr.
    (iv) Repeat (i), (ii) and (iii) for current 'l' leaving '     DD ' and superpose results for ' AA ' and ' DD '.
    Question:
    For current entering at     AA, the electric field at a distance ' rr ' from AA is    JEE Main/MCQ/Medium/Electric Current and Drift of Electrons/With diagram
  40. 40Paragraph:
    Consider a block of conducting material of resistivity '     ρ\rho ' shown in the figure. Current 'l' enters at 'A' and leaves from ' D\mathrm{D} '. We apply superposition principle to find voltage ' ΔV\Delta \mathrm{V} ' developed between ' B\mathrm{B} ' and ' C\mathrm{C} '. The calculation is done in the following steps:
    (i) Take current 'l' entering from 'A' and assume it to spread over a hemispherical surface in the block.
    (ii) Calculate field     E(r)E(r) at distance ' rr ' from AA by using Ohm's law E=ρjE=\rho j, where jj is the current per unit area at ' rr '.
    (iii) From the '     rr ' dependence of E(r)E(r), obtain the potential V(r)V(r) at rr.
    (iv) Repeat (i), (ii) and (iii) for current 'l' leaving '     DD ' and superpose results for ' AA ' and ' DD '.
    Question:
    ΔV\Delta \mathrm{V} measured between B\mathrm{B} and C\mathrm{C} is    JEE Main/MCQ/Medium/Electric Current and Drift of Electrons/With diagram
  41. 41A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold then, an electric current willJEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  42. 42An energy source will supply a constant current into the load of its internal resistance isJEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  43. 43Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are R1R_1 and R2(R2>R1)R_2\left(R_2\gt R_1\right). If the potential difference across the source having internal resistance R2\mathrm{R}_2 is zero, thenJEE Main/MCQ/Medium/Electric Current and Drift of Electrons
  44. 44A wire of length 25 m and cross-sectional area 5 mm25 \mathrm{~mm}^2 having resistivity of 2×10−6Ω m2 \times 10^{-6} \Omega \mathrm{~m} is bent into a complete circle. The resistance between diametrically opposite points will beJEE Main/MCQ/Medium/Resistance and Resistivity
  45. 45The difference of temperature in a material can convert heat energy into electrical energy. To harvest the heat energy, the material should haveJEE Main/MCQ/Medium/Resistance and Resistivity
  46. 46A wire of resistance 9Ω9 \Omega is bent to form an equilateral triangle. Then the equivalent resistance across any two vertices will be _____ ohm.JEE Main/Numerical/Medium/Resistance and Resistivity
  47. 47Which of the following resistivity ( ρ\rho ) v/s\mathrm{v} / \mathrm{s} temperature (T) curves is most suitable to be used in wire bound standard resistors?JEE Main/MCQ/Medium/Resistance and Resistivity
  48. 48Resistance of a wire at 0∘C,100∘C0^{\circ} \mathrm{C}, 100^{\circ} \mathrm{C} and t∘Ct^{\circ} \mathrm{C} is found to be 10Ω,10.2Ω10 \Omega, 10.2 \Omega and 10.95Ω10.95 \Omega respectively. The temperature tt in Kelvin scale is _________JEE Main/Numerical/Medium/Resistance and Resistivity
  49. 49A wire of resistance RR and radius rr is stretched till its radius became r/2r / 2. If new resistance of the stretched wire is xRx R, then value of xx is _______JEE Main/Numerical/Medium/Resistance and Resistivity
  50. 50Two wires AA and BB are made up of the same material and have the same mass. Wire AA has radius of 2.0 mm2.0 \mathrm{~mm} and wire BB has radius of 4.0 mm4.0 \mathrm{~mm}. The resistance of wire BB is 2Ω2 \Omega. The resistance of wire AA is _____Ω\Omega.JEE Main/Numerical/Medium/Resistance and Resistivity
  51. 51Equivalent resistance of the following network is ________ Ω\Omega.JEE Main/Numerical/Medium/Resistance and Resistivity/With diagram
  52. 52In the given circuit, the current flowing through the resistance 20Ω20\Omega is 0.3A0.3A, while the ammeter reads 0.9A0.9A. The value of R1{R}_{1} is _____Ω\Omega.JEE Main/Numerical/Medium/Resistance and Resistivity/With diagram
  53. 53In the given circuit, the current in resistance R3{R}_{3} is:JEE Main/MCQ/Medium/Resistance and Resistivity/With diagram
  54. 54A wire of resistance RR and length LL is cut into 55 equal parts. If these parts are joined parallely, then resultant resistance will be :JEE Main/MCQ/Medium/Resistance and Resistivity
  55. 55Given below are two statements:
    Statement I : The equivalent resistance of resistors in a series combination is smaller than least resistance used in the combination.
    Statement II : The resistivity of the material is independent of temperature. In the light of the above statements, choose the correct answer from the options given below:    JEE Main/MCQ/Medium/Resistance and Resistivity
  56. 56A wire of resistance 160Ω160Ω is melted and drawn in a wire of one-fourth of its length. The new resistance of the wire will beJEE Main/MCQ/Medium/Resistance and Resistivity
  57. 57A rectangular parallelopiped is measured as 1cm×1cm×100cm1cm\times 1cm\times 100cm. If its specific resistance is 3×10−7Ωm3\times {10}^{-7}\Omega m, then the resistance between its two opposite rectangular faces will be _____×10−7Ω\times {10}^{-7}\Omega.
    JEE Main/Numerical/Medium/Resistance and Resistivity/With diagram
  58. 58Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R.
    Assertion A : For measuring the potential difference across a resistance of     600Ω600\Omega, the voltmeter with resistance 1000Ω1000\Omega will be preferred over voltmeter with resistance 4000Ω4000\Omega.
    Reason R : Voltmeter with higher resistance will draw smaller current than voltmeter with lower resistance.
    In the light of the above statements, choose the most appropriate answer from the options given below    JEE Main/MCQ/Medium/Resistance and Resistivity
  59. 59The resistance of a wire is 5Ω5\Omega. Its new resistance in ohm, if stretched to 55 times of its original length will be :JEE Main/MCQ/Medium/Resistance and Resistivity
  60. 60A uniform metallic wire carries a current 2A2A, when 3.4V3.4V battery is connected across it. The mass of uniform metallic wire is 8.92×10−3kg8.92\times {10}^{-3}kg, density is 8.92×103kgm−38.92\times {10}^{3}kg{m}^{-3} and resistivity is 1.7×10−8Ω−m1.7\times {10}^{-8}\Omega -m The length of wire is :JEE Main/MCQ/Medium/Resistance and Resistivity
  61. 61If a copper wire is stretched to increase its length by 2020%. The percentage increase in resistance of the wire is _____%.JEE Main/Numerical/Medium/Resistance and Resistivity
  62. 62A hollow cylindrical conductor has length of 3.14m3.14m, while its inner and outer diameters are 4mm4mm and 8mm8mm respectively. The resistance of the conductor is n×10−3Ωn\times {10}^{-3}\Omega.
    If the resistivity of the material is     2.4×10−8Ωm2.4\times {10}^{-8}\Omega m. The value of nn is _____.    JEE Main/Numerical/Medium/Resistance and Resistivity
  63. 63A 1m1m long wire is broken into two unequal parts XX and YY. The XX part of the wire is stretched into another wire WW. Length of WW is twice the length of XX and the resistance of WW is twice that of YY. Find the ratio of length of XX andYY.JEE Main/MCQ/Medium/Resistance and Resistivity
  64. 64Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
    Assertion A: Alloys such as constantan and manganin are used in making standard resistance coils.
    Reason R: Constantan and manganin have very small value of temperature coefficient of resistance.
    In the light of the above statements, choose the correct answer from the options given below.    JEE Main/MCQ/Medium/Resistance and Resistivity
  65. 65Given below are two statements :
    Statement I : A uniform wire of resistance     80Ω80\Omega is cut into four equal parts. These parts are now connected in parallel. The equivalent resistance of the combination will be 5Ω5\Omega.
    Statement II : Two resistance     2R2R and 3R3R are connected in parallel in an electric circuit. The value of thermal energy developed in 3R3R and 2R2R will be in the ratio 3:23:2.
    In the light of the above statements, choose the most appropriate answer from the options given below    JEE Main/MCQ/Medium/Resistance and Resistivity
  66. 66A wire of resistance R1{R}_{1}R1R_{1} is drawn out so that its length is increased by twice of its original length. The ratio of new resistance to original resistance is:JEE Main/MCQ/Medium/Resistance and Resistivity
  67. 67The variation of applied potential and current flowing through a given wire is shown in figure. The length of wire is 31.4cm31.4cm. The diameter of wire is measured as 2.4cm2.4cm. The resistivity of the given wire is measured as x×10−3Ωcmx\times {10}^{-3}\Omega cm. The value of xx is _____ .
    [Take     π=3.14\pi =3.14]
    JEE Main/Numerical/Medium/Resistance and Resistivity/With diagram
  68. 68A 220V,50Hz220V,50Hz AC source is connected to a 25V,5W25V,5W lamp and an additional resistance RR in series (as shown in figure) to run the lamp at its peak brightness, then the value of RR (in ohm) will be
    JEE Main/Numerical/Medium/Resistance and Resistivity/With diagram
  69. 69Two resistors R1=(4±0.8)Ω{R}_{1}=(4\pm 0.8)\Omega and R2=(4±0.4)Ω{R}_{2}=(4\pm 0.4)\Omega are connected in parallel. The equivalent resistance of their parallel combination will be :JEE Main/MCQ/Medium/Resistance and Resistivity
  70. 70The equivalent resistance of the given circuit between the terminals AA and BB is :
    JEE Main/MCQ/Medium/Resistance and Resistivity/With diagram
  71. 71A square-shaped wire with a resistance of each side 3Ω3\Omega is bent to form a complete circle. The resistance between two diametrically opposite points of the circle in a unit of Ω\Omega will is, _____.JEE Main/Numerical/Medium/Resistance and Resistivity
  72. 72The voltage drop across 15Ω15\Omega resistance in the given figure will be _______ V.V.
    JEE Main/Numerical/Medium/Resistance and Resistivity/With diagram
  73. 73What equal length of an iron wire and a copper-nickel alloy wire, each of 2mm2mm diameter connected parallel to give an equivalent resistance of 3Ω3\Omega?
    (Given resistivities of iron and copper-nickel alloy wire are     12μΩcm12\mu \Omega cm and 51μΩcm51\mu \Omega cm respectively)    JEE Main/MCQ/Medium/Resistance and Resistivity
  74. 74The resistance of a conductor at 15∘C15^{\circ}C is 16Ω16\Omega and at 100∘C100^{\circ}C is 20Ω.20\Omega . What will be the temperature coefficient of resistance of the conductor?JEE Main/MCQ/Medium/Resistance and Resistivity
  75. 75In the given figure switches S1{S}_{1} and S2{S}_{2} are in open condition. The resistance across abab when the switches S1{S}_{1} and S2{S}_{2} are closed is ________Ω.\Omega .
    JEE Main/Numerical/Medium/Resistance and Resistivity/With diagram
  76. 76Two wires of same length and thickness having specific resistances 6Ωcm6\Omega cm and 3Ωcm3\Omega cm respectively are connected in parallel. The effective resistivity is ρΩcm\rho \Omega cm. The value of ρ\rho to the nearest integer, is ___ .JEE Main/Numerical/Medium/Resistance and Resistivity
  77. 77A conducting wire of length ll, area of crosssection AA and electric resistivity ρ\rho is connected between the terminals of a battery. A potential difference VV is developed between its ends, causing an electric current. If the length of the wire of the same material is doubled and the area of cross-section is halved, the resultant current would be___JEE Main/MCQ/Medium/Resistance and Resistivity
  78. 78Consider four conducing materials copper, tungsten, mercury and aluminum with resistivity ρC,ρT,ρM{\rho }_{C},{\rho }_{T},{\rho }_{M} and ρA{\rho }_{A} respectively. Then :JEE Main/MCQ/Medium/Resistance and Resistivity
  79. 79Space between two concentric conducting spheres of radii aa and bb (b>a)(b\gt a) is filled with a medium of resistivity ρ\rho . The resistance between the two spheres will be:JEE Main/MCQ/Medium/Resistance and Resistivity
  80. 80In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line.

    One may conclude that    JEE Main/MCQ/Medium/Resistance and Resistivity/With diagram
  81. 81In the figure shown, what is the current (in Ampere) drawn from the battery? You are given:
    R1=15Ω,R2=10Ω,R3=20Ω,R4=5Ω,R5=25Ω,R6=30Ω,E=15V{R}_{1}=15\Omega ,{R}_{2}=10\Omega ,{R}_{3}=20\Omega ,{R}_{4}=5\Omega ,{R}_{5}=25\Omega ,{R}_{6}=30\Omega ,E=15V
    JEE Main/MCQ/Medium/Resistance and Resistivity/With diagram
  82. 82The actual value of resistance RR , shown in the figure is 30Ω.30\Omega . This is measured in an experiment as shown using the standard formula R=VIR=\dfrac{V}{I} , where VV and II are the readings of the voltmeter and ammeter, respectively. If the measured value of RR is 55% less, then the internal resistance of the voltmeter is:

    JEE Main/MCQ/Medium/Resistance and Resistivity/With diagram
  83. 83A uniform wire of length ll and radius rr has a resistance of 100Ω100 \text{Ω}. It is recast into a wire of radius r2\dfrac{r}{2}. The resistance of new wire will be-JEE Main/MCQ/Medium/Resistance and Resistivity
  84. 84The resistance of an electrical toaster has a temperature dependence given by R(T)=R0[1+α(T−T0)]R\left(T\right)={R}_{0}\left[1+\alpha \left(T-{T}_{0}\right)\right] in its range of operation. At T0=300K,R=100ΩandatT=500K,R=120Ω{T}_{0}=300K,R=100\Omega \text{and}atT=500K,R=120\Omega. The toaster is connected to a voltage source at 200V200V and its temperature is raised at a constant rate from 300to500K300\text{to}500K in 30s30s. The total work done in raising the temperature is :

    Note: This question was awarded as the bonus since all options were incorrect in the exam.    JEE Main/MCQ/Medium/Resistance and Resistivity
  85. 85The resistance of a wire is RR. It is bent at the middle by 180∘180^{\circ} and both the ends are twisted together to make a shorter wire. The resistance of the new wire isJEE Main/MCQ/Medium/Resistance and Resistivity
  86. 86This question contains Statement-1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements.
    Statement-1: The temperature dependence of resistance is usually given as     R=R0(1+αΔt)R=R_0(1+\alpha \Delta t). The resistance of a wire changes from 100Ω100 \Omega to 150Ω150 \Omega when its temperature is increased from 27∘C27^{\circ} \mathrm{C} to 227∘C227^{\circ} \mathrm{C}. This implies that α=2.5×10−3/∘C\alpha=2.5 \times 10^{-3} /{ }^{\circ} \mathrm{C}.
    Statement 2:     R=Ri(1+αΔT)R=R_i(1+\alpha \Delta T) is valid only when the change in the temperature ΔT\Delta T is small and ΔR=\Delta R= (R−R0)≪R0\left(R-R_0\right) \ll R_0.    JEE Main/MCQ/Medium/Resistance and Resistivity
  87. 87The resistance of a wire is 5 ohm5 \mathrm{~ohm} at 50∘C50^{\circ} \mathrm{C} and 6 ohm6 \mathrm{~ohm} at 100∘C100^{\circ} \mathrm{C}. The resistance of the wire at 0∘C0^{\circ} \mathrm{C} will beJEE Main/MCQ/Medium/Resistance and Resistivity
  88. 88The resistance of a bulb filament is 100Ω100 \Omega at a temperature of 100∘C100^{\circ} \mathrm{C}. If its temperature coefficient of resistance be 0.0050.005 per ∘C{ }^{\circ} \mathrm{C}, its resistance will become 200Ω200 \Omega at a temperature ofJEE Main/MCQ/Medium/Resistance and Resistivity
  89. 89A material ' BB ' has twice the specific resistance of ' AA '. A circular wire made of ' BB ' has twice the diameter of a wire made of ' AA '. Then for the two wires to have the same resistance, the ratio ℓA/ℓB\ell_A / \ell_B of their respective lengths must beJEE Main/MCQ/Medium/Resistance and Resistivity
  90. 90A piece of copper and another of germanium are cooled from room temperature to 77 K77 \mathrm{~K}, the resistance ofJEE Main/MCQ/Medium/Resistance and Resistivity
  91. 91The length of a given cylindrical wire is increased by 100%100 \%. Due to the consequent decrease in diameter the change in the resistance of the wire will beJEE Main/MCQ/Medium/Resistance and Resistivity
  92. 92A strip of copper and another of germanium are cooled from room temperature to 80 K80 \mathrm{~K}. The resistance ofJEE Main/MCQ/Medium/Resistance and Resistivity
  93. 93By increasing the temperature, the specific resistance of a conductor and a semiconductorJEE Main/MCQ/Medium/Resistance and Resistivity
  94. 94Refer to the figure given below, current between terminals AA and BB is _____ A.
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  95. 95Two resistors of 200 Ω200 \, \Omega and 400 Ω400 \, \Omega are connected in series with a battery of 100100 V. A bulb rated at 200200 V, 100100 W is connected across the 400 Ω400 \, \Omega resistance. The potential drop across the bulb is _______ V.JEE Main/MCQ/Medium/Combination of Resistances
  96. 96A regular hexagon is formed by six wires each of resistance rΩr \Omega and the corners are joined to the centre by wires of same resistance. If the current enters at one corner and leaves at the opposite corner, the equivalent resistance of the hexagon between the two opposite corners will beJEE Main/MCQ/Medium/Combination of Resistances
  97. 97A wire of uniform resistance λΩ/m\lambda \Omega / \mathrm{m} is bent into a circle of radius rr and another piece of wire with length 2r2 r is connected between points AA and B(AOB)B(A O B) as shown in figure. The equivalent resistance between points AA and BB is ____\_\_\_\_ Ω\Omega.
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  98. 98Two known resistances of RΩR \Omega and 2RΩ2 R \Omega and one unknown resistance XΩX \Omega are connected in a circuit as shown in the figure. If the equivalent resistance between points AA and BB in the circuit is XΩX \Omega, then the value of XX is ____\_\_\_\_ Ω\Omega.
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  99. 99From the combination of resistors with resistance values R1=R2=R3=5ΩR_1=R_2=R_3=5 \Omega and R4=10ΩR_4=10 \Omega, which of the following combination is the best circuit to get an equivalent resistance of 6Ω6 \Omega ?JEE Main/MCQ/Medium/Combination of Resistances
  100. 100Find the equivalent resistance between two ends of the following circuit
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  101. 101A wire of resistance R is bent into an equilateral triangle and an identical wire is bent into aa square. The ratio of resistance between the two end points of an edge of the triangle to that of the square is
    Options    JEE Main/MCQ/Medium/Combination of Resistances
  102. 102To determine the resistance (R)(R) of a wire, a circuit is designed below. The V−IV-I characteristic curve for this circuit is plotted for the voltmeter and the ammeter readings as shown in figure. The value of RR is ______ Ω\Omega.
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  103. 103The effective resistance between AA and BB, if resistance of each resistor is RR, will be
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  104. 104The equivalent resistance between A\mathrm{A} and B\mathrm{B} is :
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  105. 105A wire of resistance 20Ω20 \Omega is divided into 10 equal parts, resulting pairs. A combination of two parts are connected in parallel and so on. Now resulting pairs of parallel combination are connected in series. The equivalent resistance of final combination is _____ Ω\Omega.JEE Main/Numerical/Medium/Combination of Resistances
  106. 106In the given figure R1=10Ω,R2=8Ω,R3=4Ω\mathrm{R}_1=10 \Omega, \mathrm{R}_2=8 \Omega, \mathrm{R}_3=4 \Omega and R4=8Ω\mathrm{R}_4=8 \Omega. Battery is ideal with emf 12 V12 \mathrm{~V}. Equivalent resistant of the circuit and current supplied by battery are respectively :
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  107. 107Twelve wires each having resistance 2Ω2 \Omega are joined to form a cube. A battery of 6 V6 \mathrm{~V} emf is joined across point aa and cc. The voltage difference between ee and ff is ______V.
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  108. 108A network of four resistances is connected to 9V9V battery, as shown in figure. The magnitude of voltage difference between the points AA and BB is __________ VV.
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  109. 109In the given circuit, the current II through the battery will be
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  110. 110
    The current flowing through     R2{R}_{2} is :    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  111. 1111010 resistors each of resistance 10Ω10Ω can be connected in such as to get maximum and minimum equivalent resistance. The ratio of maximum and minimum equivalent resistance will be________.JEE Main/Numerical/Medium/Combination of Resistances
  112. 112The equivalent resistance of the circuit shown below between points aa and bb is :
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  113. 113The equivalent resistance between AA and BB as shown in figure is:
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  114. 114In the given circuit the value of ∣I1+I3I2∣\left|\dfrac{{I}_{1}+{I}_{3}}{{I}_{2}}\right| is:
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  115. 115Equivalent resistance between the adjacent corners of a regular nn-sided polygon of uniform wire of resistance RR would be :JEE Main/MCQ/Medium/Combination of Resistances
  116. 116The equivalent resistance between AandBAandB of the network shown in figure:
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  117. 117If the potential difference between BB and DD is zero, the value of xx is 1nΩ\dfrac{1}{n}\Omega. The value of nn is ______.
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  118. 118The equivalent resistance between AandBA\text{and}B is _______.
    .    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  119. 119In the following circuit, the magnitude of current I1{I}_{1}, is ______ AA.
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  120. 120In the given circuit, the equivalent resistance between the terminal A and B is ____ Ω\Omega
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  121. 121A cell of emf 90V90V is connected across series combination of two resistors each of 100Ω100\Omega resistance. A voltmeter of resistance 400Ω400\Omega is used to measure the potential difference across each resistor. The reading of the voltmeter will be:JEE Main/MCQ/Medium/Combination of Resistances
  122. 122As shown in the figure, a network of resistors is connected to a battery of 24V24V with an internal resistance of 3Ω3\Omega. The currents through the resistors R4{R}_{4} and R5{R}_{5} are I4{I}_{4} and I5{I}_{5} respectively. The values of I4{I}_{4} and I5{I}_{5} are:
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  123. 123The current I flowing through the given circuit will be _____ AA.
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  124. 124An electrical bulb rated 220V,100W220V,100W, is connected in series with another bulb rated 220V220V, 60W60W. If the voltage across combination is 220V220V, the power consumed by the 100W100W bulb will be about _____ WW.JEE Main/Numerical/Medium/Combination of Resistances
  125. 125A current of 15mA15mA flows in the circuit as shown in figure. The value of potential difference between the points AA and BB will be
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  126. 126Eight copper wire of length ll and diameter d are joined in parallel to form a single composite conductor of resistance RR. If a single copper wire of length 2l2l have the same resistance (R)\left(R\right) then its diameter will be _____ dd.JEE Main/Numerical/Medium/Combination of Resistances
  127. 127In the given figure, the value of V0{V}_{0} will be _____ VV.
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  128. 128Two resistors are connected in series across a battery as shown in figure. If a voltmeter of resistance 2000Ω2000\Omega is used to measure the potential difference across 500Ω500\Omega resister, the reading of the voltmeter will be _____ VV
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  129. 129All resistances in figure are 1Ω1\Omega each. The value of current 'II' is a5A\dfrac{a}{5}A. The value of aa is _____ .
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  130. 130In the given circuit 'a' is an arbitrary constant. The value of mm for which the equivalent circuit resistance is minimum, will be x2\sqrt{\dfrac{x}{2}}. The value of xx is _____ .
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  131. 131Find the equivalent resistance between point AA and BB
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  132. 132An aluminium wire is stretched to make its length, 0.40.4% larger. The percentage change in resistance isJEE Main/MCQ/Medium/Combination of Resistances
  133. 133The length of a given cylindrical wire is increased to double of its original length. The percentage increase in the resistance of the wire will be _____ %JEE Main/Numerical/Medium/Combination of Resistances
  134. 134What will be the most suitable combination of three resistors A=2Ω,B=4Ω,C=6ΩA=2\Omega ,B=4\Omega ,C=6\Omega so that (223)Ω\left(\dfrac{22}{3}\right)\Omega is equivalent resistance of combination?JEE Main/MCQ/Medium/Combination of Resistances
  135. 135The ratio of the equivalent resistance of the network (shown in figure) between the points aa and bb when switch is open and switch is closed is x:8x:8. The value of xx is
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  136. 136First, a set of nn equal resistors of 10Ω10\Omega each are connected in series to a battery of E.M.F. 20V20V and internal resistance 10Ω.10\Omega . A current II is observed to flow. Then, the nn resistors are connected in parallel to the same battery. It is observed that the current is increased 2020 times, then the value of nn is ___________.JEE Main/Numerical/Medium/Combination of Resistances
  137. 137If you are provided a set of resistances, 2Ω,4Ω,6Ω2\Omega ,4\Omega ,6\Omega and 8Ω.8\Omega . Connect these resistances to obtain an equivalent resistance of 463Ω\dfrac{46}{3}\Omega.JEE Main/MCQ/Medium/Combination of Resistances
  138. 138In the given figure, the emf of the cell is 2.2V2.2V and if internal resistance is 0.6Ω0.6\Omega. Calculate the power dissipated in the whole circuit:
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  139. 139A Copper (Cu)(Cu) rod of length 25cm25cm and cross-sectional area 3mm23{mm}^{2} is joined with a similar Aluminium (Al)(Al) rod as shown in figure. Find the resistance of the combination between the ends AA and B.B.
    (Take resistivity of Copper     =1.7×10−8Ωm=1.7\times {10}^{-8}\Omega m, Resistivity of aluminium =2.6×10−8Ωm=2.6\times {10}^{-8}\Omega m)
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  140. 140The voltage across the 10Ω10\Omega resistor in the given circuit is xx volt.

    The value of     xx to the nearest integer is _____.    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  141. 141The equivalent resistance of series combination of two resistors is s.s. When they are connected in parallel, the equivalent resistance is p.p. If s=np,s=np, then the minimum value for nn is ______.
    (Round off to the Nearest Integer)    JEE Main/Numerical/Medium/Combination of Resistances
  142. 142A current of 6A6A enters one corner PP of an equilateral triangle PQRPQR having 33 wires of resistance 2Ω2\Omega each and leaves by the corner R.R. The currents i1{i}_{1} in ampere is
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  143. 143Four resistance 40Ω,60Ω,90Ω40\Omega ,60\Omega ,90\Omega 110Ω110\Omega and make the arms of a quadrilateral ABCDABCD. Across ACAC is a battery of emf 40V40V and internal resistance negligible. The potential difference across BDBD in VV is __________
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  144. 144Two resistors 400Ω400\Omega and 800Ω800\Omega are connected in series across a 6∨6∨ battery. The potential difference measured by a voltmeter of 10kΩ10k\Omega across 400Ω400\Omega resistor is close to:JEE Main/MCQ/Medium/Combination of Resistances
  145. 145An ideal cell of emf 10V10V is connected in circuit shown in figure. Each resistance is 2Ω2\Omega. The potential difference (in VV) across the capacitor when it is fully charged is _____________
    JEE Main/Numerical/Medium/Combination of Resistances/With diagram
  146. 146In the given circuit diagram, a wire is joining points B and D. The current in this wire is:

    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  147. 147The series combination of two batteries, both of the same emf 10V,10V, but different internal resistance of 20Ω20 \Omega and 5Ω,5 \Omega , is connected to the parallel combination of two resistors 30Ω30 \Omega and xΩ.\text{x}\Omega . The voltage difference across the battery of internal resistance 20Ω20 \Omega is zero, the value of x\text{x} (in Ω)\Omega ) is____JEE Main/Numerical/Medium/Combination of Resistances
  148. 148In the figure, potential difference between AA and BB is:

    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  149. 149The current I1{I}_{1} (in AA ) flowing through 1Ω1\Omega resistor in the following circuit is:
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  150. 150The resistive network shown below is connected to a D.C.D.C. source of 16V.16V. The power consumed by the network is 44 Watt. The value of RR is:
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  151. 151A metal wire of resistance 3Ω3 \Omega is elongated to make a uniform wire of double its previous length. This new wire is now bent and the ends joined to make a circle. If two points on this circle make an angle 60o{60}^{o} at the center, the equivalent resistance between these two points will be:JEE Main/MCQ/Medium/Combination of Resistances
  152. 152Determine the charge on the capacitor in the following circuit:
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  153. 153A wire of resistance RR is bent to form a square ABCDABCD as shown in the figure. The effective resistance between EE and CC is:
    (     EE is mid-point of arm CDCD )
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  154. 154A uniform metallic wire has a resistance of 18Ω18\Omega and is bent into an equilateral triangle. Then, the resistance between any two vertices of the triangle is:JEE Main/MCQ/Medium/Combination of Resistances
  155. 155In the given circuit the internal resistance of the 18V18V cell is negligible. If R1=400Ω,R3=100Ω{R}_{1}=400\Omega ,{R}_{3}=100\Omega and R4=500Ω{R}_{4}=500\Omega and the reading of an ideal voltmeter across R4{R}_{4} is 5V,5V, then the value of R2{R}_{2} will be:

    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  156. 156In the given circuit all resistance is of the value of RR ohm each. The equivalent resistance between AA and BB is:

    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  157. 157In the given circuit all resistances are of value RR ohm each. The equivalent resistance between AA and BB is:
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  158. 158
    A     9V9V battery with an internal resistance of 0.5Ω0.5\Omega is connected across an infinite network, as shown in the figure. All ammeters A1,A2,A3{A}_{1},{A}_{2},{A}_{3} and voltmeter VV are ideal.
    Choose the correct statement.    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  159. 159

    In the above circuit the current in each resistance is:    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  160. 160In the electric network shown, when no current flows through the 4Ω4\Omega resistor in the arm EB, the potential difference between the points A and D will be:

    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  161. 161Six equal resistances are connected between points P,Q\mathrm{P}, \mathrm{Q} and R\mathrm{R} as shown in figure. Then net resistance will be maximum between :
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  162. 162A letter ′A′{ }^{\prime} \mathrm{A}^{\prime} is constructed of a uniform wire with resistance 1.0Ω1.0 \Omega per cm\mathrm{cm}, The sides of the letter are 20 cm20 \mathrm{~cm} and the cross piece in the middle is 10 cm10 \mathrm{~cm} long. The apex angle is 60 . The resistance between the ends of the legs is close to:JEE Main/MCQ/Medium/Combination of Resistances
  163. 163The current I\mathrm{I} drawn from the 5 volt source will be
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  164. 164An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the length and radii of the wires are in the ratio of 4/34 / 3 and 2/32 / 3, then the ratio of the currents passing through the wire will beJEE Main/MCQ/Medium/Combination of Resistances
  165. 165The resistance of the series combination of two resistances is SS. When they are joined in parallel through total resistance is PP. If S=nPS=n P, then the minimum possible value of nn isJEE Main/MCQ/Medium/Combination of Resistances
  166. 166The total current supplied to the circuit by the battery is
    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  167. 167A 3 volt battery with negligible internal resistance is connected in a circuit as shown in the figure. The current I\mathrm{I}, in the circuit will be

    JEE Main/MCQ/Medium/Combination of Resistances/With diagram
  168. 168Two cells of emfs 11 V and 22 V and internal resistance 2 Ω2\,\Omega and 1 Ω1\,\Omega, respectively connected in parallel, gave a current of 11 A through an external resistance. If the polarity of one cell is reversed, then value of current through the external resistance will be α5\dfrac{\alpha}{5} A. The value of α\alpha is __________.JEE Main/Numerical/Medium/Electric Cell or Battery
  169. 169When an external resistance of 5 Ω5\ \Omega is connected across terminals of a cell, a current of 0.25 A0.25\text{ A} flows through it. When the 5 Ω5\ \Omega resistor is replaced by a 2 Ω2\ \Omega resistor, a current of 0.5 A0.5\text{ A} flows through it. The internal resistance of the cell is _______ Ω\Omega.JEE Main/Numerical/Medium/Electric Cell or Battery
  170. 170For the two cells having same EMF EE and internal resistance rr, the current passing through the external resistor 6Ω6 \Omega is same when both the cells are connected either in parallel or in series. The value of internal resistance rr is ____\_\_\_\_ Ω\Omega.JEE Main/MCQ/Medium/Electric Cell or Battery
  171. 171Two cells of emf 1 V and 2 V and internal resistance 2Ω2 \Omega and 1Ω1 \Omega, respectively, are connected in series with an external resistance of 6Ω6 \Omega. The total current in the circuit is I1\mathrm{I}_1. Now the same two cells in parallel configuration are connected to same external resistance. In this case, the total current drawn is I2I_2. The value of (I1I2)\left(\frac{I_1}{I_2}\right) is x3\frac{x}{3}. The value of xx is _____.JEE Main/Numerical/Medium/Electric Cell or Battery
  172. 172What is the current through the battery in the circuit shown below
    JEE Main/MCQ/Medium/Electric Cell or Battery/With diagram
  173. 173Given below are two statements :
    Statement-I : The equivalent emf of two nonideal batteries connected in parallel is smaller than either of the two emfs.
    Statement-II : The equivalent internal resistance of two nonideal batteries connected in parallel is smaller than the internal resistance of either of the two batteries.
    In the light of the above statements, choose the correct answer from the options given below.    JEE Main/MCQ/Medium/Electric Cell or Battery
  174. 174In the given circuit, the terminal potential difference of the cell is :
    JEE Main/MCQ/Medium/Electric Cell or Battery/With diagram
  175. 175Two cells are connected in opposition as shown. Cell E1{E}_{1} is of 8V8V emf and 2Ω2\Omega internal resistance; the cell E2{E}_{2} is of 2V2V emf and 4Ω4\Omega internal resistance. The terminal potential difference of cell E2{E}_{2} is ______ VV.JEE Main/Numerical/Medium/Electric Cell or Battery/With diagram
  176. 176Two identical cells each of emf 1.5V1.5V are connected in series across a 10Ω10\Omega resistance. An ideal voltmeter connected across 10Ω10\Omega resistance reads 1.5V1.5V. The internal resistance of each cell is _____ Ω\Omega.JEE Main/Numerical/Medium/Electric Cell or Battery
  177. 177In the circuit diagram shown in figure given below, the current flowing through resistance 3Ω3\Omega is x3A\dfrac{x}{3}A. The value of xx is ________.
    JEE Main/Numerical/Medium/Electric Cell or Battery/With diagram
  178. 178For the given circuit, in the steady state, ∣VB−VD∣=\left|{V}_{B}-{V}_{D}\right|= _____ VV.
    JEE Main/Numerical/Medium/Electric Cell or Battery/With diagram
  179. 179Two identical cells, when connected either in parallel or in series gives same current in an external resistance 5Ω5\Omega. The internal resistance of each cell will be ______ Ω\Omega.JEE Main/Numerical/Medium/Electric Cell or Battery
  180. 180Two cells are connected between points AA and BB as shown. Cell 1 has emf of 12V12V and internal resistance of 3Ω3\Omega. Cell 2 has emf of 6V6V and internal resistance of 6Ω6\Omega. An external resistor RR of 4Ω4\Omega is connected across AA and BB. The current flowing through RR will be ______ AA.
    JEE Main/Numerical/Medium/Electric Cell or Battery/With diagram
  181. 181Two sources of equal emfs are connected in series. This combination is connected to an external resistance RR. The internal resistances of the two sources are r1{r}_{1} and r2(r1>r2){r}_{2}\left({r}_{1}\gt {r}_{2}\right). If the potential difference across the source of internal resistance r1{r}_{1} is zero then the value of RR will beJEE Main/MCQ/Medium/Electric Cell or Battery
  182. 182The combination of two identical cells, whether connected in series or parallel combination provides the same current through an external resistance of 2Ω2\Omega. The value of internal resistance of each cell isJEE Main/MCQ/Medium/Electric Cell or Battery
  183. 183Two cells of the same EMF EE but different internal resistances r1{r}_{1} and r2{r}_{2} are connected in series with an external resistance RR as shown in the figure. The terminal potential difference across, the second cell is found to be zero. The external resistance RR must then be:
    JEE Main/MCQ/Medium/Electric Cell or Battery/With diagram
  184. 184Two identical cells each of emf 1.5V1.5V are connected in parallel across a parallel combination of two resistors each of resistance 20Ω20\Omega. A voltmeter connected in the circuit measures 1.2V1.2V. The internal resistance of each cell is :JEE Main/MCQ/Medium/Electric Cell or Battery
  185. 185Five identical cells each of internal resistance 1Ω1\Omega and emf 5V5V are connected in series and in parallel with an external resistance R.R. For what value of R,R, current in series and parallel combination will remain the same?JEE Main/MCQ/Medium/Electric Cell or Battery
  186. 186In the given figure, a battery of emf EE is connected across a conductor PQPQ of length ll and different area of cross-sections having radii r1{r}_{1} and r2(r2<r1).{r}_{2}\left({r}_{2}\lt {r}_{1}\right).

    Choose the correct option as one moves from     PP to QQ.    JEE Main/MCQ/Medium/Electric Cell or Battery/With diagram
  187. 187In an electric circuit, a call of certain emf provides a potential difference of 1.25V1.25V across a load resistance of 5Ω.5\Omega . However, it provides a potential difference of 1V1V across a load resistance of 2Ω.2\Omega .The emf of the cell is given by x10V.\dfrac{x}{10}V. Then the value of xx is ..JEE Main/Numerical/Medium/Electric Cell or Battery
  188. 188Two cells of emf 2E2E and EE with internal resistance r1{r}_{1}and r2{r}_{2} respectively are connected in series to an external resistor RR (see figure). The value of R,R, at which the potential difference across the terminals of the first cell becomes zero is
    JEE Main/MCQ/Medium/Electric Cell or Battery/With diagram
  189. 189A cell E1{E}_{1} of emf 6V6V and internal resistance 2Ω2\Omega is connected with another cell E2{E}_{2} of emf 4V4V and internal resistance 8Ω8\Omega (as shown in the figure). The potential difference across points XX and YY is:
    JEE Main/MCQ/Medium/Electric Cell or Battery/With diagram
  190. 190A battery of 3.0V3.0\text{V} is connected to a resistor dissipating 0.5W0.5\text{W} of power. If the terminal voltage of the battery is 2.5V2.5\text{V}, the power dissipated within the internal resistance is:JEE Main/MCQ/Medium/Electric Cell or Battery
  191. 191To verify Ohm’s law, a student connects the voltmeter across the battery as shown in the figure. The measured voltage is plotted as a function of the current, and the following graph is obtained:

    If     Vo{V}_{o} is almost zero, identify the correct statement:    JEE Main/MCQ/Medium/Electric Cell or Battery/With diagram
  192. 192In the given circuit, an ideal voltmeter connected across the 10Ω10\Omega resistance reads 2V2V . The internal resistance rr , of each cell is:
    JEE Main/MCQ/Medium/Electric Cell or Battery/With diagram
  193. 193For the circuit shown, with R1=1.0Ω{R}_{1}=1.0\Omega , R2=2.0Ω{R}_{2}=2.0\Omega , E1=2V{E}_{1}=2V and E2=E3=4V,{E}_{2}={E}_{3}=4V, the potential difference between the points ‘a’‘a’ and ‘b’‘b’ is approximately ( inVinV ):
    JEE Main/MCQ/Medium/Electric Cell or Battery/With diagram
  194. 194Two batteries with e.m.f. 12V12V and 13V13V are connected in parallel across a load resistor of 10Ω10\Omega. The internal resistance of the two batteries are 1Ω1\Omega and 2Ω2\Omega respectively. The voltage across the load lies between,JEE Main/MCQ/Medium/Electric Cell or Battery
  195. 195

    In the circuit shown, the current in the     1Ω1\Omega resistor is:    JEE Main/MCQ/Medium/Electric Cell or Battery/With diagram
  196. 196In the circuit shown, current (in A) through 50 V50 \mathrm{~V} and 30 V30 \mathrm{~V} batteries are, respectively:
    JEE Main/MCQ/Medium/Electric Cell or Battery/With diagram
  197. 197A d.c. main supply of e.m.f. 220V220V is connected across a storage battery of e.m.f. 200V200V through a resistance of 1Ω1\Omega. The battery terminals are connected to external resistance RR. The minimum value of RR, so that a current passes through the battery to charge it is:JEE Main/MCQ/Medium/Electric Cell or Battery
  198. 198A dc source of emf E1=100 V\mathrm{E}_1=100 \mathrm{~V} and internal resistance r=0.5Ωr=0.5 \Omega, a storage battery of emf E2=90 V\mathrm{E}_2=90 \mathrm{~V} and an external resistance R\mathrm{R} are connected as shown in figure. For what value of R no current will pass through the battery?
    JEE Main/MCQ/Medium/Electric Cell or Battery/With diagram
  199. 199The supply voltage to a room is 120V120V. The resistance of the lead wires is 6Ω6\Omega. A 60W60W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240W240W heater is switched on in parallel to the bulb?JEE Main/MCQ/Medium/Electric Cell or Battery
  200. 200In the circuit, the galvanometer GG shows zero deflection. If the batteries AA and BB have negligible internal resistance, the value of the resistor R\mathrm{R} will be
    JEE Main/MCQ/Medium/Electric Cell or Battery/With diagram
  201. 201The negative Zn\mathrm{Zn} pole of a Daniell cell, sending a constant current through a circuit, decreases in mass by 0.13 g0.13 \mathrm{~g} in 30 minutes. If the electrochemical equivalent of Zn\mathrm{Zn} and Cu\mathrm{Cu} are 32.532.5 and 31.531.5 respectively, the increase in the mass of the positive Cu pole in this time isJEE Main/MCQ/Medium/Electric Cell or Battery
  202. 202The stored charge in the capacitor in steady state of the following circuit is ________ μ\muC.
    JEE Main/Numerical/Medium/Kirchoffs Laws/With diagram
  203. 203Refer to the circuit diagram given below. The heat generated across the 6 Ω6\,\Omega resistance in 100100 second is α100\dfrac{\alpha}{100} J. The value of α\alpha is _______. (Nearest integer)
    JEE Main/Numerical/Medium/Kirchoffs Laws/With diagram
  204. 204Under steady state condition the potential difference across the capacitor in the circuit is _______ V.
    JEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  205. 205Refer to the figure given below. The values of I1I_1, I2I_2 and I3I_3 are __________.
    JEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  206. 206The voltage and the current between AA and BB points shown in the circuit are _____.
    JEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  207. 207The reading of the ammeter (A)(A) in steady state in the following circuit (assuming negligible internal resistance of the ammeter) is ____\_\_\_\_ A.
    JEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  208. 208The value of current I in the electrical circuit as given below, when potential at A is equal to the potential at B, will be ____ A.
    JEE Main/Numerical/Medium/Kirchoffs Laws/With diagram
  209. 209The net current flowing in the given circuit is_______ A.

    JEE Main/Numerical/Medium/Kirchoffs Laws/With diagram
  210. 210The current flowing through the 1Ω1 \Omega resistor is n10\frac{n}{10} A. The value of nn is _________
    JEE Main/Numerical/Medium/Kirchoffs Laws/With diagram
  211. 211A potential divider circuit is shown in figure. The output voltage V0{V}_{0} isJEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  212. 212Figure shows a part of an electric circuit. The potentials at points a,ba,b and cc are 30V,12V30V,12V and 2V2V respectively. The current through the 20Ω20\Omega resistor will be,
    JEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  213. 213A 16Ω16\Omega wire is bent to form a square loop. A 9V9V supply having an internal resistance of 1Ω1\Omega is connected across one of its sides. The potential drop across the diagonals of the square loop is __________×10−1V\times {10}^{-1}V.JEE Main/Numerical/Medium/Kirchoffs Laws
  214. 214
    The value of current in the     6Ω6\Omega resistance is:    JEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  215. 215In the figure shown, the current in the 10V10V battery is close to :
    JEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  216. 216In the circuit, given in the figure currents in different branches and value of one resistor are shown. Then potential at point BB with respect to the point AA is:
    JEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  217. 217In the given circuit diagram, the currents, I1=−0.3A,I4=0.8A{I}_{1}=-0.3 A, {I}_{4}=0.8 A and I5=0.4A,{I}_{5}=0.4 A, are flowing as shown. The currents I2,I3{I}_{2}, {I}_{3} and I6,{I}_{6}, respectively, are:

    JEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  218. 218In the circuit shown, the potential difference between A\mathrm{A} and BB is

    JEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  219. 219In the given circuit the cells have zero internal resistance. The currents (in amperes) passing through resistance R1{R}_{1} and R2{R}_{2} respectively, are:

    JEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  220. 220When the switch S,S, in the circuit shown, is closed, then the value of current ii will be:

    JEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  221. 221The circuit shown here has two batteries of 8.0 V8.0 \mathrm{~V} and 16.0 V16.0 \mathrm{~V} and three resistors 3Ω,9Ω3 \Omega, 9 \Omega and 9Ω9 \Omega and a capacitor of 5.0μF5.0 \mu \mathrm{F}.


    How much is the current     I\mathrm{I} in the circuit in steady state?    JEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  222. 222A 5 V5 \mathrm{~V} battery with internal resistance 2Ω2 \Omega and a 2 V2 \mathrm{~V} battery with internal resistance 1Ω1 \Omega are connected to a 10Ω10 \Omega resistor as shown in the figure. The current in the 10Ω10 \Omega resistor is
    JEE Main/MCQ/Medium/Kirchoffs Laws/With diagram
  223. 223The Kirchhoff's first law (∑i=0)\left(\sum i=0\right) and second law (∑iR=∑E)\left(\sum i R=\sum E\right), where the symbols have their usual meanings, are respectively based onJEE Main/MCQ/Medium/Kirchoffs Laws
  224. 224An electric power line having total resistance of 2Ω2 \Omega, delivers 1 kW of power at 250 V. The percentage efficiency of transmission line is ____\_\_\_\_ .JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  225. 225There are ' nn ' number of identical electric bulbs, each is designed to draw a power pp independently from the mains supply. They are now joined in series across the main supply. The total power drawn by the combination is :JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  226. 226A motor operating on 100 V draws a current of 1 A. If the efficiency of the motor is 91.6%91.6 \%, then the loss of power in units of cal/s\mathrm{cal} / \mathrm{s} isJEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  227. 227The battery of a mobile phone is rated as 4.2 V , 5800 mAh. How much energy is stored in it when fully charged ?JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  228. 228A heater is designed to operate with a power of 1000 W1000 \mathrm{~W} in a 100 V100 \mathrm{~V} line. It is connected in combination with a resistance of 10Ω10 \Omega and a resistance RR, to a 100 V100 \mathrm{~V} mains as shown in figure. For the heater to operate at 62.5 W62.5 \mathrm{~W}, the value of R\mathrm{R} should be _____Ω\Omega.
    JEE Main/Numerical/Medium/Electric Power and Heating Effect of Current/With diagram
  229. 229Water boils in an electric kettle in 20 minutes after being switched on. Using the same main supply, the length of the heating element should be _____ to _____ times of its initial length if the water is to be boiled in 15 minutes.JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  230. 230The number of electrons flowing per second in the filament of a 110 W110 \mathrm{~W} bulb operating at 220 V220 \mathrm{~V} is : (\left(\right. Given e=1.6×10−19C)\left.\mathrm{e}=1.6 \times 10^{-19} \mathrm{C}\right)JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  231. 231The ratio of heat dissipated per second through the resistance 5Ω5 \Omega and 10Ω10 \Omega in the circuit given below is :
    JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current/With diagram
  232. 232An electric bulb rated 50 W−200 V50 \mathrm{~W}-200 \mathrm{~V} is connected across a 100 V100 \mathrm{~V} supply. The power dissipation of the bulb is:JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  233. 233In the following circuit, the battery has an emf of 2V2V and an internal resistance of 23Ω\dfrac{2}{3}\Omega. The power consumption in the entire circuit is ______ WW.JEE Main/Numerical/Medium/Electric Power and Heating Effect of Current/With diagram
  234. 234By what percentage will the illumination of the lamp decrease if the current drops by 2020%?JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  235. 235When a potential difference VV is applied across a wire of resistance RR, it dissipates energy at a rate W.W. If the wire is cut into two halves and these halves are connected mutually parallel across the same supply, the energy dissipation rate will become:JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  236. 236An electric toaster has resistance of 60Ω60\Omega at room temperature (27∘C)\left(27^{\circ}C\right). The toaster is connected to a 220V220V supply. If the current flowing through it reaches 2.75A2.75A, the temperature attained by toaster is around: (if α=2×10−4C−1∘\alpha =2\times {10}^{-4}C-1^{\circ} )JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  237. 237A potential V0{V}_{0} is applied across a uniform wire of resistance R.R. The power dissipation is P1.{P}_{1}. The wire is then cut into two equal halves and a potential of V0{V}_{0} is applied across the length of each half. The total power dissipation across two wires is P2.{P}_{2}. The ratio of P2:P1{P}_{2}:{P}_{1} is x:1.\sqrt{x}:1. The value of xx is _____.JEE Main/Numerical/Medium/Electric Power and Heating Effect of Current
  238. 238Different combination of 33 resistors of equal resistance RR are shown in the figures. The increasing order for power dissipation is:
    (A)
    (B)
    (C)
    (D)     JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current/With diagram
  239. 239Two identical heater filaments are connected first in parallel and then in series. At the same applied voltage, the ratio of heat produced in same time for parallel to series will be:JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  240. 240The HH amount of thermal energy is developed by a resistor in 10s10s when a current of 4A4A is passed through it. If the current is increased to 16A16A, the thermal energy developed by the resistor in 10s10s will beJEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  241. 241Ratio of thermal energy released in two resistor RR and 3R3R connected in parallel in an electric circuit is :JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  242. 242Two coils require 2020 minutes and 6060 minutes respectively to produce same amount of heat energy when connected separately to the same source. If they are connected in parallel arrangement to the same source; the time required to produce same amount of heat by the combination of coils, will be _____ min⁡\min.JEE Main/Numerical/Medium/Electric Power and Heating Effect of Current
  243. 243A resistor develops 300J300J of thermal energy in 15s15s, when a current of 2A2A is passed through it. If the current increases to 3A3A, the energy developed in 10s10s is _____ JJ.JEE Main/Numerical/Medium/Electric Power and Heating Effect of Current
  244. 244A steel rod with y=2.0×1011Nm−2y=2.0\times {10}^{11}N{m}^{-2} and α=10−5C∘−1\alpha ={10}^{-5}{C^{\circ}}^{-1} of length 4m4m and area of cross-section 10cm210{cm}^{2} is heated from 0∘C0^{\circ}C to 400∘C400^{\circ}C without being allowed to extend. The tension produced in the rod is x×105Nx\times {10}^{5}N where the value of xx is _________.JEE Main/Numerical/Medium/Electric Power and Heating Effect of Current
  245. 245A resistor dissipates 192J192J of energy in 1s1s when a current of 4A4A is passed through it. Now, when the current is doubled, the amount of thermal energy dissipated in 5s5s is _____________ J.J.JEE Main/Numerical/Medium/Electric Power and Heating Effect of Current
  246. 246An electric bulb of 500W500W at 100V100V is used in a circuit having a 200V200V supply. Calculate the resistance RR to be connected in series with the bulb so that the power delivered by the bulb is 500W500W.JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  247. 247An electric bulb rated as 200W200W at 100V100V is used in a circuit having 200V200V supply. The resistance RR that must be put in series with the bulb so that the bulb delivers the same power is ______ Ω\Omega.JEE Main/Numerical/Medium/Electric Power and Heating Effect of Current
  248. 248The energy dissipated by a resistor is 10mJ10mJ in 1s1s, when an electric current of 2mA2mA flows through it. The resistance is ________Ω\Omega. (Round off to the Nearest Integer)JEE Main/Numerical/Medium/Electric Power and Heating Effect of Current
  249. 249A resistor develops 500J500J of thermal energy in 20s20s when a current of 1.5A1.5A is passed through it. If the current is increased from 1.5A1.5A to 3A3A, what will be the energy developed in 20s20s.JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  250. 250An electrical power line, having a total resistance of 2Ω,2\Omega , delivers 1kW1kW at 220V220V. The efficiency of the transmission line is approximately :JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  251. 251Model a torch battery of length ll to be made up of a thin cylindrical bar of radius aa and a concentric thin cylindrical shell of radius bb filled in between with an electrolyte of resistivity ρ\rho (see figure). If the battery is connected to a resistance of value RR, the maximum Joule heating in RR will take place for :
    JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current/With diagram
  252. 252An elliptical loop having resistance RR, of semi major axis aa , and semi minor axis bb is placed in a magnetic field as shown in the figure. If the loop is rotated about the xx-axis with angular frequency ω\omega, the average power loss in the loop due to Joule heating is :
    JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current/With diagram
  253. 253In a building there are 1515 bulbs of 45W45W , 1515 bulbs of 100W,15100W,15 small fans of 10W10W and 22 heaters of 1kW1kW . The voltage of electric main supply is 220V220V . The minimum fuse capacity (rated value) of the building will be:JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  254. 254A cell of internal resistance rr drives current through an external resistance R.R. The power delivered by the cell to the external resistance will be maximum when:JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  255. 255Two electric bulbs, rated at (25W,220V)\left(25W,220V\right) and (100W,220V),\left(100W,220V\right), are connected in series across a 220V220\text{V} voltage source. If the 25W25W and 100W100W bulbs draw powers P1{P}_{1} and P2{P}_{2} respectively, then:JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  256. 256Two equal resistances when connected in series to a battery, consume electric power of 60 W60 \mathrm{~W}. If these resistance are now connected in parallel combination to the same battery, the electric power consumed will be :JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  257. 257A current of 2mA2 mA was passed through an unknown resistor which dissipated a power of 4.4W.4.4W. Dissipated power when an ideal power supply of 11V11 V is connected across it is:JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  258. 258A heating element has a resistance of 100Ω100\Omega at room temperature. When it is connected to a supply of 220V220V, a steady current of 2A2A passes in it and temperature is 500oC500{}^{o}C more than the room temperature. The temperature coefficient of resistance of the heating element isJEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  259. 259A constant voltage is applied between two ends of a metallic wire. If the length is halved and the radius of the wire is doubled, the rate of heat developed in the wire will be:JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  260. 260The figure shows three circuits I,III,II and IIIIII which are connected to a 3V3V battery. If the powers dissipated by the configurations I,III,II and IIIIII are P1,P2{P}_{1},{P}_{2} and P3{P}_{3} respectively, then -

    JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current/With diagram
  261. 261

    In the circuit shown, the resistance r is a variable resistance. If for     r=fRr=fR , the heat generation in r is maximum then the value of ff is    JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current/With diagram
  262. 262In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW. The voltage of the electric mains is 220 V. The minimum capacity of the main fuse of the building will be:JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  263. 263Which of the four resistances P,Q,RP, Q, R and SS generate the greatest amount of heat when a current flows from A to B ?
    JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current/With diagram
  264. 264A 6.06.0 volt battery is connected to two light bulbs as shown in figure. Light bulb 1 has resistance 3 ohm while light bulb 2 has resistance 6ohm6 \mathrm{ohm}. Battery has negligible internal resistance. Which bulb will glow brighter?
    JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current/With diagram
  265. 265Three resistors of 4Ω,6Ω4 \Omega, 6 \Omega and 12Ω12 \Omega are connected in parallel and the combination is connected in series with a 1.5 V1.5 \mathrm{~V} battery of 1Ω1 \Omega internal resistance. The rate of Joule heating in the 4Ω4 \Omega resistor isJEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  266. 266Two electric bulbs marked 25 W−220 V25 \mathrm{~W}-220 \mathrm{~V} and 100 W−220 V100 \mathrm{~W}-220 \mathrm{~V} are connected in series to a 440 V440 \mathrm{~V} supply.
    Which of the bulbs will fuse?    JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  267. 267An electric bulb is rated 220 volt −100-100 watt. The power consumed by it when operated on 110 volt will beJEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  268. 268The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W100 \mathrm{~W} and 200 V200 \mathrm{~V} lamp when not in use?JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  269. 269A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now beJEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  270. 270The electrochemical equivalent of a metal is 3.3×10−7 kg3.3 \times 10^{-7} \mathrm{~kg} per coulomb. The mass of the metal liberated at the cathode when a 3 A current is passed for 2 seconds will beJEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  271. 271A 220 volt, 1000 watt bulb is connected across a 110 volt mains supply. The power consumed will beJEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  272. 272If in the circuit, power dissipation is 150 W150 \mathrm{~W}, then R\mathrm{R} is
    JEE Main/MCQ/Medium/Electric Power and Heating Effect of Current/With diagram
  273. 273If a current is passed through a spring then the spring willJEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  274. 274A wire when connected to 220 V220 \mathrm{~V} mains supply has power dissipation P1\mathrm{P}_1. Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is P2P_2 Then P2:P1P_2: P_1 isJEE Main/MCQ/Medium/Electric Power and Heating Effect of Current
  275. 275A Wheatstone bridge is initially at room temperature and all arms of the bridge have same value of resistances (R1=R2=R3=R4)\left(R_{1}=R_{2}=R_{3}=R_{4}\right). When R3R_{3} resistance is heated to some temperature, its resistance value has gone up by 10%10 \%. The potential difference (Va−Vb)\left(V_{a}-V_{b}\right) (after R3R_{3} is heated) is ____\_\_\_\_ V.
    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  276. 276The equivalent resistance between the points AA and BB in the following circuit is x5Ω\frac{x}{5} \Omega. The value of xx is ____\_\_\_\_.
    JEE Main/Numerical/Medium/Wheatstone Bridge/With diagram
  277. 277In a meter bridge experiment to determine the value of unknown resistance, first the resistances 2Ω2 \Omega and 3Ω3 \Omega are connected in the left and right gaps of the bridge and the null point is obtained at a distance l cml \mathrm{~cm} from the left. Now when an unknown resistance xΩx \Omega is connected in parallel to 3Ω3 \Omega resistance, the null point is shifted by 10 cm to the right of wire. The value of unknown resistance xx is ____\_\_\_\_ Ω\Omega.JEE Main/Numerical/Medium/Wheatstone Bridge
  278. 278Two resistors 2Ω2 \Omega and 3Ω3 \Omega are connected in the gaps of bridge as shown in figure. The null point is obtained with the contact of jockey at some point on wire XYX Y. When an unknown resistor is connected in parallel with 3Ω3 \Omega resistor, the null point is shifted by 22.5 cm toward YY. The resistance of unknown resistor is ____\_\_\_\_ Ω\Omega.
    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  279. 279A meter bridge with two resistances R1R_{1} and R2R_{2} as shown in figure was balanced (null point) at 40 cm from the point PP. The null point changed to 50 cm from the point PP, when 16Ω16 \Omega resistance is connected in parallel to R2R_{2}. The values of resistances R1R_{1} and R2R_{2} are ____\_\_\_\_.
    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  280. 280The heat generated in 1 minute between points AA and BB in the given circuit, when a battery of 9 V with internal resistance of 1Ω1 \Omega is connected across these points is ____\_\_\_\_ J.
    JEE Main/Numerical/Medium/Wheatstone Bridge/With diagram
  281. 281A wire of resistance RR is bent into a triangular pyramid as shown in figure with each segment having same length. The resistance between points AA and BB is R/nR / n. The value of nn is :
    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  282. 282The value of unknown resistance (x)(x) for which the potential difference between BB and DD will be zero in the arrangement shown, is :
    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  283. 283In a metre-bridge when a resistance in the left gap is 2Ω2\Omega and unknown resistance in the right gap, the balance length is found to be 40cm.40cm. On shunting the unknown resistance with 2Ω,2\Omega , the balance length changes by:JEE Main/MCQ/Medium/Wheatstone Bridge
  284. 284The resistance per centimeter of a meter bridge wire is rr, with XΩX\Omega resistance in left gap. Balancing length from left end is at 40cm40cm with 25Ω25\Omega resistance in right gap. Now the wire is replaced by another wire of 2r2r resistance per centimeter. The new balancing length for same settings will be atJEE Main/MCQ/Medium/Wheatstone Bridge
  285. 285Wheatstone bridge principle is used to measure the specific resistance (S1)\left({S}_{1}\right) of given wire, having length LL, radius rr. If XX is the resistance of wire, then specific resistance is : S1=X(πr2L){S}_{1}=X\left(\dfrac{\pi {r}^{2}}{L}\right). If the length of the wire gets doubled then the value of specific resistance will be :JEE Main/MCQ/Medium/Wheatstone Bridge
  286. 286A wire of length 10cm10cm and radius 7×10−4m\sqrt{7}\times {10}^{-4}m connected across the right gap of a meter bridge. When a resistance of 4.5Ω4.5\Omega is connected on the left gap by using a resistance box, the balance length is found to be at 60cm60cm from the left end. If the resistivity of the wire is R×10−7ΩmR\times {10}^{-7}\Omega m, then value of RR is :JEE Main/MCQ/Medium/Wheatstone Bridge
  287. 287In meter bridge experiment for measuring unknown resistance 'SS', the null point is obtained at a distance 30cm30cm from the left side as shown at point DD. If RR is 5.6kΩ5.6k\Omega, then the value of unknown resistance 'SS' will be _____ Ω\Omega.
    JEE Main/Numerical/Medium/Wheatstone Bridge/With diagram
  288. 288A battery of 6V6V is connected to the circuit as shown below. The current II drawn from the battery is
    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  289. 289Resistance are connected in a meter bridge circuit as shown in the figure. The balancing length l1{l}_{1} is 40cm40cm. Now an unknown resistance xx is connected in series with PP and new balancing length is found to be 80cm80cm measured from the same end. Then the value of xx will be _____ Ω\Omega.
    JEE Main/Numerical/Medium/Wheatstone Bridge/With diagram
  290. 290The current II in the given circuit will be
    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  291. 291Current measured by the ammeter (A)\left(A\right) in the reported circuit when no current flows through 10Ω10\Omega resistance, will be _____ AA.
    JEE Main/Numerical/Medium/Wheatstone Bridge/With diagram
  292. 292A meter bridge setup is shown in the figure. It is used to determine an unknown resistance RR using a given resistor of 15Ω15\Omega. The galvanometer (G)\left(G\right) shows null defection when tapping key is at 43cm43cm mark from end AA. If the end correction for end AA is 2cm2cm, then the determined value of RR will be Ω\Omega.
    JEE Main/Numerical/Medium/Wheatstone Bridge/With diagram
  293. 293Consider a 72cm72cm long wire ABAB as shown in the figure. The galvanometer jockey is placed at PP on ABAB at a distance xcmxcm from AA. The galvanometer shows zero deflection.

    The value of     xx, to the nearest integer, is    JEE Main/Numerical/Medium/Wheatstone Bridge/With diagram
  294. 294The four arms of a Wheatstone bridge have resistances as shown in the figure. A galvanometer of 15Ω15\Omega resistance is connected across BD. Calculate the current through the galvanometer when a potential difference of 10V10V is maintained across AC.
    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  295. 295Five equal resistances are connected in a network as shown in figure. The net resistance between the points AA and BB is :
    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  296. 296The value of current i1{i}_{1} flowing from AA to CC in the circuit diagram is :
    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  297. 297In a meter bridge experiment SS is a standard resistance. RR is a resistance wire. It is found that balancing length is l=25cm.l=25cm. If RR is replaced by a wire of hall length and half diameter that of RR of same material, then the balancing distance l′l' (in cmcm ) will now be ______________.

    JEE Main/Numerical/Medium/Wheatstone Bridge/With diagram
  298. 298Four resistances of 15Ω,12Ω,4Ω15\Omega ,12\Omega ,4\Omega and 10Ω10\Omega respectively in cyclic order to form Wheatstone’s network. The resistance that is to be connected in parallel with the resistance of 10Ω10\Omega to balance the network is ______________ Ω.\Omega .JEE Main/Numerical/Medium/Wheatstone Bridge
  299. 299In a Wheatstone bridge (see fig.), Resistances PP and QQ are approximatelyequal. When R=400ΩR=400 \Omega, the bridge is balanced. On interchanging P\mathrm{P} and Q\mathrm{Q}, the value of R,\mathrm{R}, for balance, is 405Ω405 \Omega. The value of YY is close to

    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  300. 300The Wheatstone bridge shown in the figure below, gets balanced when the carbon resistor used as R1{R}_{1} has the colour code (orange, red, brown). The resistors R2{R}_{2} and R4{R}_{4} are 80Ω80\Omega and 40Ω40\Omega, respectively. Assuming that the colour code for the carbon resistors gives their accurate values, the colour code for the carbon resistor, used as R3{R}_{3}, would be
    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  301. 301In a meter bridge as shown in the figure, it is given that resistance Y=12.5ΩY=12.5\Omega and that the balance is obtained at a distance 39.5cm39.5cm from end AA (by jockey JJ). After interchanging the resistances XX and YY a new balance point is found at a distance l2{l}_{2} from end AA. What are the values of XX (in Ω\Omega) and l2{l}_{2}?

    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  302. 302In a meter bridge, as shown in the figure, it is given that resistance Y=12.5ΩY=12.5 \Omega and that the balance is obtained at a distance 39.5 cm39.5 \mathrm{~cm} from end AA (by jockey J). After interchanging the resistances XX and YY, a new balance point is found at a distance l2l_2 from end AA. What are the values of XX and l2l_2 ?
    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  303. 303On interchanging the resistances, the balance point of a meter bridge shifts to the left by 10cm10cm. The resistance of their series combination is 1kΩ1k\Omega . How much was the resistance on the left slot before interchanging the resistances?JEE Main/MCQ/Medium/Wheatstone Bridge
  304. 304In a meter bridge experiment resistances are connected as shown in the figure. Initially resistance P=4ΩP=4\Omega and the neutral point NN is at 60cm60cm from AA . Now an unknown resistance RR is connected in series to PP and the new position of the neutral point is at 80cm80cm from AA . The value of unknown resistance RR is -

    JEE Main/MCQ/Medium/Wheatstone Bridge/With diagram
  305. 305Which of the following statements is false?JEE Main/MCQ/Medium/Wheatstone Bridge
  306. 306In a metre bridge experiment null point is obtained at 40 cm40 \mathrm{~cm} from one end of the wire when resistance X\mathrm{X} is balanced against another resistance Y\mathrm{Y}. If X<Y\mathrm{X} \lt \mathrm{Y}, then the new position of the null point from the same end, if one decides to balance a resistance of 3X3 \mathrm{X} against Y\mathrm{Y}, will be close to :JEE Main/MCQ/Medium/Wheatstone Bridge
  307. 307In a sensitive meter bridge apparatus the bridge wire should possessJEE Main/MCQ/Medium/Wheatstone Bridge
  308. 308In a Wheatstone's bridge, there resistances P,Q\mathrm{P}, \mathrm{Q} and R\mathrm{R} connected in the three arms and the fourth arm is formed by two resistances S1\mathrm{S}_1 and S2\mathrm{S}_2 connected in parallel. The condition for bridge to be balanced will beJEE Main/MCQ/Medium/Wheatstone Bridge
  309. 309In a metre bridge experiment null point is obtained at 20 cm20 \mathrm{~cm} from one end of the wire when resistance XX is balanced against another resistance YY. If X<YX \lt Y, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4X4 X against Y?JEE Main/MCQ/Medium/Wheatstone Bridge
  310. 310A moving coil of galvanometer when shunted with 2 Ω2\,\Omega resistance gives a full scale deflection for a current of 500500 mA. When a resistance of 470 Ω470\,\Omega is connected in series it gives a full scale deflection for 1010 V potential applied on it. The value of resistance of galvanometer coil is __________ Ω\Omega.JEE Main/Numerical/Medium/Electric Instruments
  311. 311A voltmeter with internal resistance of x Ωx\ \Omega can be used to measure upto 2020 V. In order to increase its measuring range to 3030 V, the required modification is to _____.JEE Main/MCQ/Medium/Electric Instruments
  312. 312In the potentiometer, when the cell in the secondary circuit is shunted with 4Ω4 \Omega resistance, the balance is obtained at the length 120 cm of wire. Now when the same cell is shunted with 12Ω12 \Omega resistance, the balance is shifted to a length of 180 cm. The internal resistance of cell is ____\_\_\_\_ Ω\OmegaJEE Main/MCQ/Medium/Electric Instruments
  313. 313A moving coil galvanometer of resistance 100Ω100 \Omega shows a full scale deflection for a current of 1 mA. The value of resistance required to convert this galvanometer into an ammeter, showing full scale deflection for a current of 5 mA, is ____\_\_\_\_ Ω\OmegaJEE Main/MCQ/Medium/Electric Instruments
  314. 314Two resistors of 100Ω100 \Omega each are connected in series with a 9 V battery. A voltmeter of 400Ω400 \Omega resistance is connected to measure the voltage drop across one of the resistors. The voltmeter reading is ____\_\_\_\_ V.JEE Main/MCQ/Medium/Electric Instruments
  315. 315To compare EMF of two cells using potentiometer the balancing lengths obtained are 200 cm and 150 cm. The least count of scale is 1 cm. The percentage error in the ratio of EMFs is ____\_\_\_\_.JEE Main/MCQ/Medium/Electric Instruments
  316. 316A battery with EMF EE and internal resistance rr is connected across a resistance RR. The power consumption in RR will be maximum when :JEE Main/MCQ/Medium/Electric Instruments
  317. 317The total length of potentiometer wire AB is 50 cm in the arrangement as shown in figure. If PP is the point where the galvanometer shows zero reading then the length APA P is ____\_\_\_\_ cm.
    JEE Main/MCQ/Medium/Electric Instruments/With diagram
  318. 318In the figure shown below, a resistance of 150.4Ω150.4 \Omega is connected in series to an ammeter A of resistance 240Ω240 \Omega. A shunt resistance of 10Ω10 \Omega is connected in parallel with the ammeter. The reading of the ammeter is _____ mA.
    JEE Main/Numerical/Medium/Electric Instruments/With diagram
  319. 319A galvanometer having a coil of resistance 30Ω30 \Omega need 20 mA of current for full-scale deflection. If a maximum current of 3 A is to be measured using this galvanometer, the resistance of the shunt to be added to the galvanometer should be 30XΩ\frac{30}{X} \Omega, where XX is
    Options    JEE Main/MCQ/Medium/Electric Instruments
  320. 320

    Sliding contact of a potentiometer is in the middle of the potentiometer wire having resistance     Rp=1ΩR_p=1 \Omega as shown in the figure. An external resistance of Re=2ΩR_e=2 \Omega is connected via the sliding contact. The electric current in the circuit is :    JEE Main/MCQ/Medium/Electric Instruments/With diagram
  321. 321A galvanmeter has a coil of resistance 200Ω200 \Omega with a full scale deflection at 20μA20 \mu \mathrm{A}. The value of resistance to be added to use it as an ammeter of range (0−20)mA(0-20) \mathrm{mA} is ;JEE Main/MCQ/Medium/Electric Instruments
  322. 322In the given figure an ammeter A consists of a 240Ω240 \Omega coil connected in parallel to a 10Ω10 \Omega shunt. The reading of the ammeter is \qquad mA\mathrm{mA}
    JEE Main/Numerical/Medium/Electric Instruments/With diagram
  323. 323A galvanometer of resistance 100Ω100 \Omega when connected in series with 400Ω400 \Omega measures a voltage of upto 10 V10 \mathrm{~V}. The value of resistance required to convert the galvanometer into ammeter to read upto 10 A10 \mathrm{~A} is x×10−2Ωx \times 10^{-2} \Omega. The value of xx is :JEE Main/MCQ/Medium/Electric Instruments
  324. 324In the experiment to determine the galvanometer resistance by half-deflection method, the plot of 1/θ1 / \theta vs the resistance (R)(\mathrm{R}) of the resistance box is shown in the figure. The figure of merit of the galvanometer is _____ ×10−1 A/\times 10^{-1} \mathrm{~A} / division. [The source has emf 2V]
    JEE Main/Numerical/Medium/Electric Instruments/With diagram
  325. 325To measure the internal resistance of a battery, potentiometer is used. For R=10Ω\mathrm{R}=10 \Omega, the balance point is observed at l=500 cml=500 \mathrm{~cm} and for R=1Ω\mathrm{R}=1 \Omega the balance point is observed at l=400 cml=400 \mathrm{~cm}. The internal resistance of the battery is approximately :JEE Main/MCQ/Medium/Electric Instruments
  326. 326To measure the temperature coefficient of resistivity α\alpha of a semiconductor, an electrical arrangement shown in the figure is prepared. The arm BCBC is made up of the semiconductor. The experiment is being conducted at 25∘C25^{\circ}C and resistance of the semiconductor arm is 3mΩ3m\Omega. Arm BCBC is cooled at a constant rate of 2∘Cs−12^{\circ}C{s}^{-1}. If the galvanometer GG shows no deflection after 10s,10s, then α\alpha is:JEE Main/MCQ/Medium/Electric Instruments/With diagram
  327. 327In an ammeter, 55% of the main current passes through the galvanometer. If resistance of the galvanometer is G,G, the resistance of ammeter will be:JEE Main/MCQ/Medium/Electric Instruments
  328. 328A galvanometer has a resistance of 50Ω50\Omega and it allows maximum current of 5mA5mA. It can be converted into voltmeter to measure upto 100V100V by connecting in series a resistor of resistance.JEE Main/MCQ/Medium/Electric Instruments
  329. 329The reading in the ideal voltmeter (V)\left(V\right) shown in the given circuit diagram is:JEE Main/MCQ/Medium/Electric Instruments/With diagram
  330. 330Two resistance of 100Ω100\Omega and 200Ω200\Omega are connected in series with a battery of 4V4V and negligible internal resistance. A voltmeter is used to measure voltage across 100Ω100\Omega resistance, which gives reading as 1V1V. The resistance of voltmeter must be _______ Ω\Omega.JEE Main/Numerical/Medium/Electric Instruments
  331. 331The deflection in moving coil galvanometer falls from 2525 divisions to 55 division when a shunt of 24Ω24\Omega is applied. The resistance of galvanometer coil will be:JEE Main/MCQ/Medium/Electric Instruments
  332. 332A galvanometer having coil resistance 10Ω10\Omega shows a full scale deflection for a current of 3mA3mA. For it to measure a current of 8A8A, the value of the shunt should be:JEE Main/MCQ/Medium/Electric Instruments
  333. 333Three voltmeters, all having different internal resistances are joined as shown in figure. When some potential difference is applied across AA and BB, their readings are V1,V2{V}_{1},{V}_{2} and V3{V}_{3}. Choose the correct option.JEE Main/MCQ/Medium/Electric Instruments/With diagram
  334. 334A current of 200μA200\mu A deflects the coil of a moving coil galvanometer through 60∘60^{\circ}. The current to cause deflection through π10\dfrac{\pi }{10} radian isJEE Main/MCQ/Medium/Electric Instruments
  335. 335For designing a voltmeter of range 50V50V and an ammeter of range 10mA10mA using a galvanometer which has a coil of resistance 54Ω54Ω showing a full scale deflection for 1mA1mA as in figure.

    (A) for voltmeter     R≈50kΩR\approx 50kΩ
    (B) for ammeter     r≈0.2Ωr\approx 0.2Ω
    (C) for ammeter     r≈6Ωr\approx 6Ω
    (D) for voltmeter     R≈5kΩR\approx 5kΩ
    (E) for voltmeter     R≈500ΩR\approx 500Ω
    Choose the correct answer from the options given below:    JEE Main/MCQ/Medium/Electric Instruments/With diagram
  336. 336When a resistance of 5Ω5\Omega is shunted with a moving coil galvanometer, it shows a full scale deflection for a current of 250mA,250mA, however when 1050Ω1050\Omega resistance is connected with it in series, it gives full scale deflection for 2525 volt. The resistance of galvanometer is_________\Omega .JEE Main/Numerical/Medium/Electric Instruments
  337. 337The current sensitivity of moving coil galvanometer is increased by 2525%. This increase is achieved only changing in the number of turns of coils and area of cross section of the wire while keeping the resistance of galvanometer coil constant. The percentage change in the voltage sensitivity will be:JEE Main/MCQ/Medium/Electric Instruments
  338. 338In this figure the resistance of the coil of galvanometer GG is 2Ω2Ω. The emf of the cell is 4V4V. The ratio of potential difference across C1{C}_{1} and C2{C}_{2} is
    JEE Main/MCQ/Medium/Electric Instruments/With diagram
  339. 339As shown in the figure the voltmeter reads 2V2V across 5Ω5\Omega resistor. The resistance of the voltmeter is _____ Ω\Omega
    JEE Main/Numerical/Medium/Electric Instruments/With diagram
  340. 340A student is provided with a variable voltage source VV, a test resistor RT=10Ω{R}_{T}=10\Omega, two identical galvanometers G1{G}_{1} and G2{G}_{2} and two additional resistors, R1=10MΩ{R}_{1}=10M\Omega and R2=0.001Ω{R}_{2}=0.001\Omega. For conducting an experiment to verify ohm's law, the most suitable circuit is:JEE Main/MCQ/Medium/Electric Instruments
  341. 341The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by 5050%. The percentage change in voltage sensitivity of the galvanometer will be :JEE Main/MCQ/Medium/Electric Instruments
  342. 342In the given figure of meter bridge experiment, the balancing length ACAC corresponding to null deflection of the galvanometer is 40cm40cm. The balancing length, if the radius of the wire ABAB is doubled, will be _____ cmcm.
    JEE Main/Numerical/Medium/Electric Instruments/With diagram
  343. 343A 72Ω72\Omega galvanometer is shunted by a resistance of 8Ω8\Omega. The percentage of the total current which passes through the galvanometer isJEE Main/MCQ/Medium/Electric Instruments
  344. 344If nn represents the actual number of deflections in a converted galvanometer of resistance GG and shunt resistance SS. Then the total current II when its figure of merit is KK will beJEE Main/MCQ/Medium/Electric Instruments
  345. 345A teacher in his physics laboratory allotted an experiment to determine the resistance (G)\left(G\right) a galvanometer. Students took the observations for 13\dfrac{1}{3} deflection in the galvanometer. Which of the below is true for measuring value of GG?JEE Main/MCQ/Medium/Electric Instruments
  346. 346Consider a galvanometer shunted with 5Ω5\Omega resistance and 22% of current passes through it. What is the resistance of the given galvanometer?JEE Main/MCQ/Medium/Electric Instruments
  347. 347For full scale deflection of total 5050 divisions, 50mV50mV voltage is required in galvanometer. The resistance of galvanometer if its current sensitivity is 2div/mA2div/mA will be:JEE Main/MCQ/Medium/Electric Instruments
  348. 348A circuit to verify Ohm's law uses ammeter and voltmeter in series or parallel connected corrected correctly to the resistor. In the circuit :JEE Main/MCQ/Medium/Electric Instruments
  349. 349A galvanometer is used in laboratory for detecting the null point in electrical experiments. If, on passing a current of 6mA6mA it produces a deflection of 2∘2^{\circ}, its figure of merit is close to :JEE Main/MCQ/Medium/Electric Instruments
  350. 350A galvanometer of resistance GG is converted into a voltameter of range 0−1V0-1V by connecting a resistance RR in series with it. The additional resistance that should be connected in series with R1{R}_{1} to increase the range of the voltmeter to 0−2V0-2V will be :JEE Main/MCQ/Medium/Electric Instruments
  351. 351A galvanometer coil has 500 turns and each turn has an average area of 3×10−4m23\times {10}^{-4}{m}^{2}. If a torque of 1.5Nm1.5Nm is required to keep this coil parallel to a magnetic field when a current of 0.5A0.5A is flowing through it, the strength of the field (in TT) is _________ .JEE Main/Numerical/Medium/Electric Instruments
  352. 352Which of the following will NOT be observed when a multimeter (operating in resistance measuring mode) probes connected across a component, are just reversed?JEE Main/MCQ/Medium/Electric Instruments
  353. 353A galvanometer having a coil resistance 100Ω100 \Omega gives a full scale deflection when a current of 1mA1mA is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter given full scale deflection for a potential difference of 10V?10V?JEE Main/MCQ/Medium/Electric Instruments
  354. 354A moving coil galvanometer, having a resistance G,G, produces full scale deflection when a current IG{I}_{G} flows through it. This galvanometer can be converted into (i) an ammeter of range 0 to Io(I0>Ig){I}_{o}\left({I}_{0}\gt {I}_{g}\right) by connecting a shunt resistance RA{R}_{A} to it and (ii) into a voltmeter of range 0 to V(V=GI0)V\left(V=G{I}_{0}\right) by connecting a series resistance RV{R}_{V} to it. Then,JEE Main/MCQ/Medium/Electric Instruments
  355. 355A galvanometer of resistance 100Ω100\Omega has 5050 divisions on its scale and has sensitivity of 20μA/division20\mu A/division . It is to be converted to voltmeter with three ranges, of 0−2V,0−10V0-2V,0-10V and 0−20V.0-20V. The appropriate circuit to do so is:JEE Main/MCQ/Medium/Electric Instruments
  356. 356A moving coil galvanometer allows a full scale current of 10−4A{10}^{-4}A . A series resistance of 2×104Ω2\times {10}^{4}\Omega is required to convert the galvanometer into a voltmeter of range 0−5V0-5V . Therefore, the value of shunt resistance required to convert the above galvanometer into an ammeter of range 0−10mA0-10mA is:JEE Main/MCQ/Medium/Electric Instruments
  357. 357The resistance of a galvanometer is 50ohm50ohm and the maximum current which can be passed through it is 0.002A.0.002A. What resistance must be connected to it in order to convert it into an ammeter of range 0−0.5A?0-0.5A?JEE Main/MCQ/Medium/Electric Instruments
  358. 358A moving coil galvanometer has resistance 50Ω50\Omega and it indicates full deflection at 4mA4mA current. A voltmeter is made using this galvanometer and a 5kΩ5k\Omega resistance. The maximum voltage, that can be measured using this voltmeter, will be close to:JEE Main/MCQ/Medium/Electric Instruments
  359. 359A galvanometer, whose resistance is 50ohm50ohm , has 2525 divisions in it. When a current of 4×10−44\times {10}^{-4} A passes through it, its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range 2.5V2.5V it should be connected to a resistance of:JEE Main/MCQ/Medium/Electric Instruments
  360. 360The galvanometer deflection, when key K1{K}_{1} is closed but K2{K}_{2} is open, equals θ0{\theta }_{0} (see figure). On closing K2{K}_{2} also and adjusting R2{R}_{2} to 5Ω,5\Omega , the deflection in galvanometer becomes θ05.\dfrac{{\theta }_{0}}{5}. The resistance of the galvanometer is, then, given by [Neglect the internal resistance of battery]:

    JEE Main/MCQ/Medium/Electric Instruments/With diagram
  361. 361A galvanometer having a resistance of 20Ω20 \Omega and 30 division on both sides has figure of merit 0.005 ampere/ division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is:JEE Main/MCQ/Medium/Electric Instruments
  362. 362In a circuit for finding the resistance of a galvanometer by half deflection method, a 6V6V battery and a high resistance of 11kΩ11k\Omega are used. The figure of merit of the galvanometer is 60μAdivision−160\mu A{division}^{-1}. In the absence of shunt resistance, the galvanometer produces a deflection of θ=9\theta =9 divisions when current flows in the circuit. The value of the shunt resistance that can cause the deflection of θ2\dfrac{\theta }{2}, is closest to:JEE Main/MCQ/Medium/Electric Instruments
  363. 363A galvanometer with its coil resistance 25Ω25\Omega requires a current of 1mA1mA for its full deflection. In order to construct an ammeter to read up to a current of 2A2A the approximate value of the shunt resistance should be:JEE Main/MCQ/Medium/Electric Instruments
  364. 364When a current of 5mA5mA is passed through a galvanometer having a coil of resistance 15Ω15\Omega, it shows full-scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into a voltmeter of range 0−10V0-10V is:JEE Main/MCQ/Medium/Electric Instruments
  365. 365A galvanometer has a 50 division scale. Battery has no internal resistance. It is found that there is deflection of 40 divisions when R.B.=2400Ω.R.B.=2400\Omega .Deflection becomes 20 divisions when resistance taken from resistance box is 4900 Ω. Then we can conclude :



    Note: This question is awarded as the bonus. Now the question is corrected.    JEE Main/MCQ/Medium/Electric Instruments/With diagram
  366. 366A 50Ω50\Omega resistance is connected to a battery of 5V5V. A galvanometer of resistance 100Ω100\Omega is to be used as an ammeter to measure current through the resistance, for this a resistance rS{r}_{S} is connected to the galvanometer. Which of the following connections should be employed if the measured current is with in 11% of the current without the ammeter in the circuit?JEE Main/MCQ/Medium/Electric Instruments
  367. 367To know the resistance GG of a galvanometer by half deflection method, a battery of emf VE{V}_{E} and resistance RR is used to deflect the galvanometer by angle θ\theta . If a shunt of resistance SS is needed to get half deflection the GG, RR and SS are related by the equation:JEE Main/MCQ/Medium/Electric Instruments
  368. 368A galvanometer having a coil resistance of 100Ω100\Omega gives a full scale deflection, when a current of 1mA1mA is passed through it. The value of the resistance, which can convert this galvanometer into ammeter giving a full scale deflection for a current of 10A10A, is:JEE Main/MCQ/Medium/Electric Instruments
  369. 369A 10V10 \text{V} battery with internal resistance 1Ω\text{1} \Omega and a 15V15 \text{V} battery with internal resistance 0.6Ω0.6\Omega are connected in parallel to a voltmeter (see figure). The reading in the voltmeter will be close to:

    JEE Main/MCQ/Medium/Electric Instruments/With diagram
  370. 370

    Four bulbs     B1{B}_{1}, B2{B}_{2}, B3{B}_{3} and B4{B}_{4} of 100W100W each are connected to 220V220V main as shown in the figure. The reading in an ideal ammeter will be    JEE Main/MCQ/Medium/Electric Instruments/With diagram
  371. 371In the experiment of calibration of voltmeter, a standard cell of e.m.f. 1.11.1 volt is balanced against 440 cm440 \mathrm{~cm} of potential wire. The potential difference across the ends of resistance is found to balance against 220 cm220 \mathrm{~cm} of the wire. The corresponding reading of voltmeter is 0.50.5 volt. The error in the reading of volmeter will be:JEE Main/MCQ/Medium/Electric Instruments
  372. 372In the circuit diagrams (A, B, C and D) shown below, R\mathrm{R} is a high resistance and S\mathrm{S} is a resistance of the order of galvanometer resistance G. The correct circuit, corresponding to the half deflection method for finding the resistance and figure of merit of the galvanometer, is the circuit labelled as:
    (a)

    (b)

    (C)

    (d)    JEE Main/MCQ/Medium/Electric Instruments/With diagram
  373. 373To find the resistance of a galvanometer by the half deflection method the following circuit is used with resistances R1=9970 W,R2=30 W\mathrm{R}_1=9970 \mathrm{~W}, \mathrm{R}_2=30 \mathrm{~W} and R3=0\mathrm{R}_3=0. The deflection in the galvanometer is d. With R3=107 W\mathrm{R}_3=107 \mathrm{~W} the deflection changed to d2\frac{d}{2}. The galvanometer resistance is approximately:
    JEE Main/MCQ/Medium/Electric Instruments/With diagram
  374. 374A shunt of resistance 1 Ω1 ~\Omega is connected across a galvanometer of 120 Ω120 ~\Omega resistance. A current of 5.55.5 ampere gives full scale deflection in the galvanometer. The current that will give full scale deflection in the absence of the shunt is nearly :JEE Main/MCQ/Medium/Electric Instruments
  375. 375This question has StatementIStatement I and StatementIIStatement II. Of the four choices given after the Statements, choose the one that best describes the two Statements.

    Statement−I:Statement - I : Higher the range, greater is the resistance of ammeter.
    Statement−II:Statement - II : To increase the range of ammeter, additional shunt needs to be used across it.    JEE Main/MCQ/Medium/Electric Instruments
  376. 376Two voltameters one of copper and another of silver, are joined in parallel. When a total charge qq flows through the voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are z1z_1 and z2z_2 respectively the charge which flows through the silver voltameter isJEE Main/MCQ/Medium/Electric Instruments
  377. 377A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 volt, the resistance in ohms needed to be connected in series with the coil will beJEE Main/MCQ/Medium/Electric Instruments
  378. 378An ammeter reads up to 1 ampere. Its internal resistance is 0.81ohm0.81 \mathrm{ohm}. To increase the range to 10 A10 \mathrm{~A} the value of the required shunt isJEE Main/MCQ/Medium/Electric Instruments
  379. 379The thermo e.m.f. of a thermo-couple is 25μV/∘C25 \mu \mathrm{V} /{ }^{\circ} \mathrm{C} at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as 10−5 A10^{-5} \mathrm{~A}, is connected with the thermo couple. The smallest temperature difference that can be detected by this sytem isJEE Main/MCQ/Medium/Electric Instruments
  380. 380If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter aJEE Main/MCQ/Medium/Electric Instruments

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Electrostatics 311Kinematics 308Ray Optics 295Rotational Motion 280Magnetic Effects & Magnetism 276Atoms & Nuclei 239Gravitation 223Laws of Motion 210Semiconductors 209Dual Nature of Matter 200Oscillations 194Fluid Mechanics 192Wave Optics 191Alternating Current 190Thermodynamics 190Work Energy Power 183Capacitors 180Kinetic Theory 168Electromagnetic Waves 165Electromagnetic Induction 153Units & Dimensions 149Waves 142Center of Mass, Momentum & Collision 130Thermal Properties of Matter 126Mathematics in Physics 121Mechanical Properties of Solids 118Experimental Physics 70Magnetic Properties of Matter 57Modern Physics 5

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