Q 12-04-160JEE MainJEE Main 2022 (28 Jul, Shift 1)Easy
The current sensitivity of a galvanometer can be increased by :
(A) decreasing the number of turns
(B) increasing the magnetic field
(C) decreasing the area of the coil
(D) decreasing the torsional constant of the spring
Choose the most appropriate answer from the options given below :
Answer: (D) (B) and (D) only
Current sensitivity $\dfrac{\phi}{I} = \dfrac{NAB}{k}$.
It increases with more turns, larger area, stronger field and a smaller torsional constant. So (B) and (D) only.
Solution by Sreeraj P, M.Sc Physics