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(C) Current sensitivity is defined as $I_s = \frac{NAB}{k}$, where $N$ is the number of turns, $A$ is the area, $B$ is the magnetic field, and $k$ is

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will be doubled, remains unchanged

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(C) Current sensitivity is defined as $I_s = \frac{NAB}{k}$, where $N$ is the number of turns, $A$ is the area, $B$ is the magnetic field, and $k$ is the torsional constant.If $N$ is doubled, $I_s$ becomes $2 	imes I_s$, meaning it is doubled.Voltage sensitivity is defined as $V_s = \frac{I_s}{R} = \frac{NAB}{kR}$, where $R$ is the resistance of the coil.Since the resistance $R$ is directly proportional to the length of the wire, and the length is proportional to the number of turns $(R \propto N)$, doubling $N$ also doubles $R$.Substituting these into the formula: $V_s = \frac{(2N)AB}{k(2R)} = \frac{NAB}{kR}$.Thus, the voltage sensitivity remains unchanged.

In the moving coil galvanometer, if the number of turns in the coil is doubled, then the current sensitivity . . . . . . and the voltage sensitivity . . . . . . .

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