Why should the spring/ suspension wire in a moving coil galvanometer have low torsional constant?

Explanation

### Step-by-Step Solution:

1. **Understanding the Function of a Moving Coil Galvanometer**:
- A moving coil galvanometer is an instrument used to measure small electric currents. It operates based on the interaction between a magnetic field and a coil of wire that carries current.

2. **Role of the Suspension Wire**:
- The coil of the galvanometer is suspended by a spring or suspension wire. This wire must allow the coil to rotate freely in response to the magnetic torque generated by the current flowing through it.

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