Question

Sensitivity of a moving coil galvanometer can be increased by

• A. Decreasing the number of turns of coil
• B. Increasing the number of turns of coil
• C. Decreasing the area of a coil
• D. By using a weak magnet

Answer 1

The correct option is B Increasing the number of turns of coil

Current sensitivity of moving coil galvanometer $I_s=\frac{NBA}{k}$

where $N$ is the number of turns in the coil, $A$ is the area of the coil and $B$ is the magnetic field.

$⟹$ $I_s\propto N$

Thus sensitivity of moving coil galvanometer can be increased by increaseing the number of turns of coil.