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 isA. `(NBAi_0)/(3pi)`B. `(3NBAi_0)/(2pi)`C. `(NBAi_0pi)/(3)`D. `(3NBAi_0)/(pi)`

In a moving coil galvanometer, there is a coil of copper having number

1.	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 isA. `(NBAi_0)/(3pi)`B. `(3NBAi_0)/(2pi)`C. `(NBAi_0pi)/(3)`D. `(3NBAi_0)/(pi)`
Answer» Correct Answer - D As `i=(k)/(NBA)theta`, so `k=(NBAi)/(theta)=(NBAi_0)/(pi//3)=(3NBAi_0)/(pi)`

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