Question

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

• A. \( 30 \, \mu\text{A} \)
• B. \( 120 \, \mu\text{A} \)
• C. \( 60 \, \mu\text{A} \)
• D. \( 180 \, \mu\text{A} \)

Hint:

The deflection angle in a moving coil galvanometer is proportional to the current passing through it. Always use the proportionality relation \( \frac{I_2}{I_1} = \frac{\theta_2}{\theta_1} \) to calculate unknown currents when deflection angles are given.