Hi there,

Hope you are doing well these days, as far as I have studied about this topic ,

Galvanometer is a device that is used to measure or detect small amount of current.A current carrying coil placed in a magnetic field develops a torque and rotates. As per torque=NIABSIN(theta)

Where,.

N=no.of turns

I=current

A=area of coil

B=magnetic field

theta =the angle at which coil rotates.

Hope this helps!

Thankyou!