JEE MAIN - Physics (2022 - 28th July Morning Shift - No. 11)
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 :
(B) and (C) only
(C) and (D) only
(A) and (C) only
(B) and (D) only
Wyjaśnienie
$$NiAB = k\theta $$
$$ \Rightarrow {\theta \over i} = {{NAB} \over k}$$
$$\Rightarrow$$ Sensitivity increases if $$B \uparrow $$ and $$k \downarrow $$