Moving coil galvanometer operates on a Permanent Magnet Moving Coil(PMMC) mechanism and was designed by the scientist D'arsnoval.

It is of two types:

1. Suspended coil
2. Pivoted coil type / Tangent galvanometer.

Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque that rotates the coil about its axis of suspension in such a way that the magnetic flux passing through the coil is maximum.

What is true about the deflection in a moving coil galvanometer?

directly proportional to the number of turns in the coil

deflection = NABI/k