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JEE Main 2023 (11 Apr, Shift 1) · Kirchhoff's Laws & Measuring Instruments

Kirchhoff's Laws & Measuring Instruments question from JEE Main 2023 (11 Apr, Shift 1)

Q98JEE Main 2023 · 11 APR · SHIFT 1Medium

Kirchhoff's Laws & Measuring Instruments

The current sensitivity of moving coil galvanometer is increased by $25\%$ . This increase is achieved only by changing in the number of turns of coils and area of cross section of the wire while keeping the resistance of galvanometer coil constant. The percentage change in the voltage sensitivity will be:

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Answer: (a)

Voltage sensitivity $V_s = \frac{I_s}{R}$ .
R is kept constant and $I_s$ rises by 25%.
So $V_s$ also rises by 25%.
So the answer is (a) +25%.

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