The coil in a moving coil galvanometer experiences torque proportional to current passes through it. If a steady current $i$ is passed through it the steady deflection of the coil is found to be $90^o$ . Now the steady current is switched off and a charge $q$ is suddenly passed through coil. If the coil has $N$ turns of area $A$ and its moment of inertia is $I$ about the axis it is going to rotate then the maximum angle through which it deflects upon passing charge $q$ is
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