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(B) The sensitivity $S$ of a tangent galvanometer is defined as the deflection produced per unit current,given by $S = \frac{	heta}{i}$.From the prin

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Number of turns increases

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(B) The sensitivity $S$ of a tangent galvanometer is defined as the deflection produced per unit current,given by $S = \frac{	heta}{i}$.From the principle of the tangent galvanometer,$i = K 	an 	heta$,where $K = \frac{2R B_H}{\mu_0 N}$ is the reduction factor.Substituting $i$ in the sensitivity formula,we get $S = \frac{	heta}{K 	an 	heta} = \frac{1}{K} \cdot \frac{	heta}{	an 	heta}$.For small angles,$	an 	heta \approx 	heta$,so $S \approx \frac{1}{K} = \frac{\mu_0 N}{2R B_H}$.From this expression,it is clear that the sensitivity $S$ is directly proportional to the number of turns $N$.Therefore,to increase the sensitivity,the number of turns $N$ must be increased.

The sensitivity of a tangent galvanometer is increased if

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