Ina moving coil galvanometer, a coil of area `pi cm^(2)` and `10` windings is used. Magnetic
Channel: Doubtnut
Date: 2020-04-05

Ina moving coil galvanometer, a coil of area `pi cm^(2)` and `10` windings is used. Magnetic field strength applied on the coil is `1` tesla and torsional stiffness of the torsional spring `6xx10^(-5)N.M//"rad"`. A needle is welded with the coil. Due to limited space, the coil (or needle) can rotate only by `90^(@)`. For marking. the `90^(@)` space is equaly   mg src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/RES_DPP_PHY_10_E01_021_Q01.png" width="80%"