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(B) In a moving coil galvanometer,the torque acting on the coil is given by $	au = NIAB \sin 	heta$. In the equilibrium position,this magnetic torqu

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$A$ moving coil galvanometer

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(B) In a moving coil galvanometer,the torque acting on the coil is given by $	au = NIAB \sin 	heta$. In the equilibrium position,this magnetic torque is balanced by the restoring torque of the spring,$	au_r = k \phi$,where $\phi$ is the deflection. Thus,$NIAB = k \phi$,which implies $\phi = (\frac{NAB}{k}) i$. Since $N, A, B,$ and $k$ are constants,we have $\phi \propto i$. Therefore,if the current $i$ is doubled,the deflection $\phi$ is also doubled. In a tangent galvanometer,the current is proportional to the tangent of the deflection $(i \propto 	an 	heta)$,so the deflection does not double when the current doubles.

If the current is doubled,the deflection is also doubled in

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