Question bank/JEE Main/Physics

JEE MainPhysicsModerateElectric current

A galvanometer having a coil resistance 100Ω100\Omega gives a full
scale deflection when a current of 1 mA is passed through it. What is
the value of the resistance which can convert this galvanometer into a
voltmeter giving full scale deflection for a potential difference of 10
V?

Show answer and solution
Vg=igRg=0.1VV_{g} = i_{g}R_{g} = 0.1V
V=10VV = 10V
R=Rg(VVg−1)R = R_{g}(\frac{V}{V_{g}} - 1) =100×99=9.9KΩ= 100 \times 99 = 9.9K\Omega

Source: Grass-G / P-19 Physics paper 28 Nov Fourth.docx

More JEE Main questionsChapter practice

Need a video for this idea?

Scan any doubt from your notes and get a whiteboard explanation.

Scan a doubtView plans