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

Answer: (B)

Sensitivity of a galvanometer is the deflection produced for a unit current flowing through it, i.e.
$\frac{\varphi }{l}=\frac{NBA}{C}$
To increase the sensitivity of a galvanometer, we should
(i) increase the number of turns $(N)$ of coil
(ii) increase the area of coil $(A)$
(iii) use a powerful magnet