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Magnetic Properties of Matter

JEE Main level, single correct, medium

22 of 57

Question 22 of 57

A bar magnet is demagnetized by inserting it inside a solenoid of length $0.2m,100$ turns, and carrying a current of $5.2A.$ The coercivity of the bar magnet is:

Show answer and solution

Answer: (B) $2600A/m$

Coercivity

=nI=\dfrac{100}{0.2}\times 5.2A/m

=2600A/m

JEE Main question paper PDF

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JEE Main 2025 Apr 2 Shift 1 question paper

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More Physics practice

Magnetic Properties of MatterTwo identical small bar magnets each of dipole moment $3\sqrt{5}$ J/T are placed at a center to center separation of $10$ cm, with their axes perpendicular to each other as shown in figure. The value of magnetic field at the point P midway between the magnets is $\alpha \times 10^{-3}$ T. The value of $\alpha$ is ______.
( $\mu_0=4\pi \times 10^{-7}$ Tm/A)
Magnetic Properties of MatterA solenoid has a core made of material with relative permeability $400$ . The magnetic field produced in the interior of solenoid is $1.0$ T. The magnetic intensity in SI units is $\alpha \times 10^5$ . The value of $\alpha$ is ______.
(Free space permeability $\mu_0=4\pi \times 10^{-7}$ SI units.)
Magnetic Properties of MatterGiven below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason(R).
Assertion (A) : Magnetic monopoles do not exist.
Reason (R) : Magnetic field lines are continuous and form closed loops.
In the light of the above statements, choose the most appropriate answer from the options given below :
Magnetic Properties of MatterThe percentage increase in magnetic field (B) when space within a current carrying solenoid is filled with magnesium (magnetic susceptibility $\left.\chi_{\mathrm{mg}}=1.2 \times 10^{-5}\right)$ is :
Magnetic Properties of MatterA solenoid having area $A$ and length ' $l$ ' is filled with a material having relative permeability 2. The magnetic energy stored in the solenoid is :
Magnetic Properties of MatterThe relationship between the magnetic susceptibility $(\chi)$ and the magnetic permeability $(\mu)$ is given by :
( $\mu_0$ is the permeability of free space and $\mu_{\mathrm{r}}$ is relative permeability)

JEE Main Physics practice question on Magnetic Properties of Matter (Magnetism and Properties of Magnet), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.

A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2m,1000.2m,1000.2m,100 turns, and carrying a current of 5.2A.5.2A.5.2A. The coercivity of the bar magnet is:

JEE Main question paper PDF

More Physics practice

A bar magnet is demagnetized by inserting it inside a solenoid of length $0.2m,100$ turns, and carrying a current of $5.2A.$ The coercivity of the bar magnet is: