Question

Do some research and then describe the operation of a spring-coil galvanometer.

Answer 1

to explain the operation of a spring-coil galvanometer

if the galvanometer having N coils that carry current kept in strong magnets

due to the coil rotates the rorque will be generated

that torque is $\tau$ = k $\theta$

and

$\tau$ = N i A B

by equating

N i A B = k $\theta$

$\theta$ / i = N A B / k