A moving coil galvanometer has resistance 50 Ω and it indicates full deflection at 4mA current. A voltmeter is made using this galvanometer and a 5 k Ω resistance. The maximum voltage, that can be measured using this voltmeter, will be close to: (a) 15 V (b) 10 V (c) 40 V (d) 20 V

Answer: (d). Maximum voltage V = Ig(G + R). V = 4 × 10⁻³ × (50 + 5000) = 20.2 V So the answer is (d) 20 V.

A moving coil galvanometer has resistance 50 Ω and it indicates full… | JEE Main 2019 (9 Apr, Shift 1)

Q153JEE Main 2019 · 9 APR · SHIFT 1Easy

Kirchhoff's Laws & Measuring Instruments

A moving coil galvanometer has resistance 50 $\Omega$ and it indicates full deflection at 4mA current. A voltmeter is made using this galvanometer and a 5 k $\Omega$ resistance. The maximum voltage, that can be measured using this voltmeter, will be close to:

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Answer: (d)

Maximum voltage $V = I_g(G + R)$ .
$V = 4 \times 10^{-3} \times (50 + 5000) = 20.2\text{ V}$
So the answer is (d) 20 V.

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Kirchhoff's Laws & Measuring Instruments question from JEE Main 2019 (9 Apr, Shift 1)

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