Consider a moving coil galvanometer (MCG) :A | vedclass

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(A) $A :$ The torque $	au = C	heta$,where $C$ is the torsional constant. Thus,$[C] = [	au]/[	heta] = [ML^2 T^{-2}] / [1] = [ML^2 T^{-2}]$. Stateme

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$A, B$ only

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(A) $A :$ The torque $	au = C	heta$,where $C$ is the torsional constant. Thus,$[C] = [	au]/[	heta] = [ML^2 T^{-2}] / [1] = [ML^2 T^{-2}]$. Statement $A$ is correct.$B :$ Current sensitivity $(I_s) = \frac{NBA}{k}$ and Voltage sensitivity $(V_s) = \frac{I_s}{R} = \frac{NBA}{kR}$. Increasing $N$ increases $I_s$,but $R$ also increases with $N$,so $V_s$ may not increase. Statement $B$ is correct.$C :$ Since $V_s = \frac{NBA}{kR}$ and $R \propto N$,if $N 	o 2N$,then $R 	o 2R$. Thus,$V_s' = \frac{(2N)BA}{k(2R)} = V_s$. The voltage sensitivity remains unchanged. Statement $C$ is incorrect.$D :$ To convert $MCG$ to an ammeter,a small shunt resistance is connected in parallel. Statement $D$ is incorrect.$E :$ Current sensitivity $I_s = \frac{NBA}{k}$,so $I_s \propto N$. It depends directly on the number of turns. Statement $E$ is incorrect.Therefore,only $A$ and $B$ are correct.

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