Question

Moving coil galvanometer operates on Permanent Magnet Moving Coil (PMMC) mechanism.

Moving coil galvanometers are of two types
(a) Suspended coll
(b) Pivoted coil type or 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. This torque tends to rotate the coil about its axis of suspension in such a way that the magnetic flux passing through the coil is maximum.

$\left(i\right)$ A moving coil galvanometer is an instrument which

• A. is used to measure emf
• B. is used to measure potential difference
• C. is used to measure resistance
• D. gives a deflection when a current flows through its coil

Answer 1

The correct option is D gives a deflection when a current flows through its coil

A moving coil galvanometer is an instrument which is used to measure electric current.

Principle: A current-carrying coil when placed in an external magnetic field experiences magnetic torque. The angle through which the coil is deflected due to the effect of the magnetic torque is proportional to the magnitude of current in the coil.

It is a sensitive electromagnetic device which can measure low currents even of the order of a few microamperes via deflection of the coil.