A current of 200 deflects the coil of a moving coil galvanometer through 60°. The current to cause deflection through π/10 radian is: (a) 120 μ A (b) 180 μ A (c) 30 μ A (d) 60 μ A

Answer: (d). In a moving coil galvanometer I ∝ θ. π/10 rad = 18° I = 200 × 18/60 = 60, so the answer is (d).

A current of 200 deflects the coil of a moving coil galvanometer… | JEE Main 2024 (27 Jan, Shift 2)

Q49JEE Main 2024 · 27 JAN · SHIFT 2Easy

Kirchhoff's Laws & Measuring Instruments

A current of $200\ \mu\text{A}$ deflects the coil of a moving coil galvanometer through $60^\circ$ . The current to cause deflection through $\frac{\pi}{10}$ radian is:

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Answer: (d)

In a moving coil galvanometer $I \propto \theta$ .
$\frac{\pi}{10}\text{ rad} = 18^\circ$
$I = 200 \times \frac{18}{60} = 60\ \mu\text{A}$ , so the answer is (d).

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