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JEE Main 2023 (31 Jan, Shift 2) · Kirchhoff's Laws & Measuring Instruments

Kirchhoff's Laws & Measuring Instruments question from JEE Main 2023 (31 Jan, Shift 2)

Q99JEE Main 2023 · 31 JAN · SHIFT 2Medium

Kirchhoff's Laws & Measuring Instruments

The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by $50\%$ . The percentage change in voltage sensitivity of the galvanometer will be:

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Answer: (a)

$I_s = \frac{NAB}{k} \propto N$ ; coil resistance $R \propto N$ (more turns, more wire).
$V_s = \frac{I_s}{R} = \frac{NAB}{kR}$ , so N cancels.
So the answer is (a) $0\%$ .

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