A moving coild galvanometer with a lamp-and-scale arrangement has a coil of 50 turns of
Channel: Doubtnut
Date: 2020-08-23

A moving coild galvanometer with a lamp-and-scale arrangement has a coil of 50 turns of mean area 1.5 `cm^(2)` per turn and the effective strength of the field (radial) is 0.02T. If a current of `10^(-9)` A produces a deflection of 1 cm on a scale placed at 1 m away, calcualte the steady torque required to hold the suspension twisted through 1 radian.