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MHT CET 2023 (14 May, Shift 2) · Kirchhoff's Laws & Measuring Instruments

Kirchhoff's Laws & Measuring Instruments question from MHT CET 2023 (14 May, Shift 2)

Q94MHT CET 2023 · 14 MAY · SHIFT 2Medium

Kirchhoff's Laws & Measuring Instruments

When moving coil galvanometer (MCG) is converted into a voltmeter, the series resistance is ' $n$ ' times the resistance of galvanometer. How many times that of MCG the voltmeter is now capable of measuring voltage?

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Answer: (c)

Galvanometer alone measures $V_g = I_g G$ .
With series $R = nG$ : $V = I_g(G + nG) = (n + 1) I_g G$
$\dfrac{V}{V_g} = n + 1$ . So the answer is (c).

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