In a moving coil galvanometer, there is a coil of copper having number of insulated turns N,
Channel: Doubtnut
Date: 2020-08-02

In a moving coil galvanometer, there is a coil of copper having number of insulated turns N, each of area A. The coil is suspended in a radial magnetic field B. The moment of inertia of the coil about its rotational axis is I. The scale divisions in the galvanometer are n and resistance of the coil is R.   If a current `i_0` in the coil produces a deflection of `pi//3` radian to the pointer of galvanometer, the value of torsional constant of the spring is