Question

Moving coil galvanometer operates on Permanent Magnet Moving Coll (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.

$\left(iii\right)$The deflection in a moving coil galvanometer is

• A. directly proportional to torsional constant of spring
• B. directly proportional to the number of turns in the coil
• C. inversely proportional to the area of the coil
• D. inversely proportional to the current in the coil

Answer 1

The correct option is B directly proportional to the number of turns in the coil

The deflection in amoving coil galvanometer is defined as
$\varphi =\frac{NABI}{k}$
$\therefore \varphi \propto N$

Where $N$ is number of turns of the coil
Hence option $B$