A moving coil galvanometer has 100 turns and each turn has an area `2.0 cm^2`. The magnetic field produced by the magnet is `0.01 T`. The deflection in the coil is `0.05` radian when a current of `10 mA` is passed through it. Find the torsional constant of the suspension wire.

Explanation

To find the torsional constant of the suspension wire in a moving coil galvanometer, we can use the relationship between the current, the number of turns, the area of each turn, the magnetic field, the deflection angle, and the torsional constant.

### Step-by-Step Solution:

1. **Identify the Given Values:**
- Number of turns (N) = 100
- Area of each turn (A) = 2.0 cm² = 2.0 × 10⁻⁴ m² (since 1 cm² = 10⁻⁴ m²)
- Magnetic field (B) = 0.01 T
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