Practice portal › Moving Charges and Magnetism › Moving Coil Galvanometer and its Conversion

A current of 200 μA deflects the coil of a moving coil galvanometer through 60°. The current to cause deflection through π/(10) radian is

Asked in JEE Main 27th Jan 2nd Shift 2024 · Galvanometer sensitivity and figure of merit

(1) 120 μA
(2) 30 μA
(3) 180 μA
(4) 60 μA

Answer: (4) 60 μA

Step-by-step solution

I ∝ θ.

60° = π/3 rad; (π/10)/(π/3) = 0.3

I = 0.3 × 200 = 60 μA

Why the other options are wrong

(1) Took π rad as 360°, so π/(10) = 36° and I = (36)/(60) × 200.
(2) Took π/(10) as 9°.
(3) Scaled inversely or mixed degree and radian.

More Moving Coil Galvanometer and its Conversion questions

All Moving Coil Galvanometer and its Conversion questions →

Reading this solution needs no sign-in. You only sign in to practise against the clock and keep your progress.

Practise this with a timer