Question:
A galvanometer is used in laboratory for detecting the null point in electrical experiments. If, on passing a current of $6 \mathrm{~mA}$ it produces a deflection of $2^{\circ}$, its figure of merit is close to :
Correct Option: 4
Solution:
(4) Given,
Current passing through galvanometer, $I=6 \mathrm{~mA}$
Deflection, $\theta=2^{\circ}$
Figure of merit of galvanometer
$=\frac{I}{\theta}=\frac{6 \times 10^{-3}}{2}=3 \times 10^{-3} \mathrm{~A} / \mathrm{div}$
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