Question

The sensitivity of moving coil galvanometer is inversely proportional to

• A. current it measures.
• B. number of turns in the coil.
• C. magnetic induction of horse shoe magnet.
• D. twist constant of phosphor bronze wire.

Hint:

In galvanometers, the sensitivity increases as the number of turns in the coil decreases.

Answer 1

The Correct Option is B

Step 1: Understanding the relationship.
The sensitivity \( S \) of a moving coil galvanometer is given by: \[ S = \frac{1}{N B \cdot k} \] Where: - \( N \) is the number of turns in the coil, - \( B \) is the magnetic induction, - \( k \) is the twist constant of the suspension. Thus, the sensitivity is inversely proportional to the number of turns \( N \). Step 2: Conclusion.
The sensitivity is inversely proportional to the number of turns in the coil, so the correct answer is (B) number of turns in the coil.