Please explain the following 29th question with reason.

Dear Student
Moving coil galvanometer is based on the fact that when a current carrying coil is placed in magnetic field it experiences a torque.
This torque is counter balanced by a spring system and deflection in that spring is proportional to current because it measure the  torque which is proportional to the current.
$$\begin{gathered} I =\frac{k\theta }{NBA} \\ So \\ I \alpha \theta \end{gathered}$$

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