Question

A moving coil galvanometer has N number of turns in a coil of effective area A, it carries a current I. The magnetic field B is radial. The torque acting on the coil is ______.

Options

• NA²B²I 

• NABI²

• N²ABI

• NABI

Answer 1

A moving coil galvanometer has N number of turns in a coil of effective area A, it carries a current I. The magnetic field B is radial. The torque acting on the coil is NABI.

Explanation:

τ = MB sin θ

⇒ τ_max = NiAB, [θ = 90°]