The sensitivity of a moving coil galvanometer | vedclass

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(D) The torque acting on the coil of a moving coil galvanometer is given by $	au = nABi \sin 	heta$. For small angles,$\sin 	heta \approx 	heta$.

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torsional constant of the phosphor bronze suspension wire.

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(D) The torque acting on the coil of a moving coil galvanometer is given by $	au = nABi \sin 	heta$. For small angles,$\sin 	heta \approx 	heta$. The restoring torque is $	au_r = C 	heta$,where $C$ is the torsional constant of the suspension wire.Equating the torques: $C 	heta = nABi$.The current sensitivity $S_i$ is defined as the deflection per unit current: $S_i = \frac{	heta}{i} = \frac{nAB}{C}$.From this expression,it is clear that the sensitivity $S_i$ is inversely proportional to the torsional constant $C$ of the suspension wire.

The sensitivity of a moving coil galvanometer is inversely proportional to

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