Question

If the number of turns in the coil of a galvanometer are decreased, then the resistance of galvanometer

• A. may increase or decrease
• B. increases
• C. remains the same
• D. decreases

Hint:

Resistance of a coil directly depends on the total length of wire used.

Answer 1

The Correct Option is D

Step 1: Resistance of a coil.
Resistance of a wire is \[ R = \rho \frac{l}{A} \]
Step 2: Relation with number of turns.
Total length of wire \( l \) is proportional to number of turns.
Step 3: Effect of decreasing turns.
When number of turns decreases, the length of wire decreases.
Step 4: Conclusion.
Hence, resistance of galvanometer decreases.