JEE Advanced 2020 Full Test 4 Paper 2

In a moving coil galvanometer, torque on the coil can be expressed as τ∝i, where i is current through the wire. The rectangular coil of the galvanometer having number of turns N, area A and moment of inertia I is placed in magnetic field B. The torsion constant of spring in the galvanometer is C and charge Q is passed through the coil almost instantaneously. If the maximum angle through which coil deflected is ‌

KNABQ

√4CI

. (lgnore the damping in mechanical oscillations).