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(B) The current sensitivity of a moving coil galvanometer is given by the formula $S = \frac{NAB}{k}$,where $N$ is the number of turns,$A$ is the area

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The torsional constant of its suspension

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(B) The current sensitivity of a moving coil galvanometer is given by the formula $S = \frac{NAB}{k}$,where $N$ is the number of turns,$A$ is the area of the coil,$B$ is the magnetic field strength,and $k$ (or $C$) is the torsional constant of the suspension wire.To increase the sensitivity $S$,we must increase $N$,$A$,or $B$,or decrease the torsional constant $k$.Therefore,decreasing the torsional constant of the suspension is the correct method to increase sensitivity.Thus,the correct option is $B$.

In order to increase the sensitivity of a moving coil galvanometer,one should decrease

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