A moving-coil galvanometer coil twists through when a current of passes through it

PHYSICS · Numerical · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism

Problem

A moving-coil galvanometer coil twists through

90^\circ

when a current of

1\,\mu\text{A}

passes through it. If the area of the coil is

10^{-4}\,\text{m}^2

and it has

100

turns, calculate the magnetic field of the galvanometer magnet. Given

k=10^{-8}\,\text{N m degree}^{-1}