Q 12-04-183JEE MainJEE Main 2020 (5 Sep, Shift 2)Easy
A galvanometer is used in the laboratory for detecting the null point in electrical experiments. If, on passing a current of $6$ mA, it produces a deflection of $2^\circ$, its figure of merit is close to:
Answer: (D) $3\times10^{-3}$ A/div
The figure of merit is the current needed for unit deflection:
$$G = \frac{I}{\theta} = \frac{6\times10^{-3}}{2} = 3\times10^{-3}\ \text{A/div}$$
Solution by Sreeraj P, M.Sc Physics