A 100 cm long solenoid having diameter 2 cm and 1000 turns has a primary solenoid closely wound near its mid point. If the coefficient of mutual inductance between the coils is 0.002 H, then find the number of turns in secondary coil.

Explanation

To solve the problem, we need to find the number of turns in the secondary coil (N2) using the given information about the primary solenoid and the coefficient of mutual inductance (M).

### Step-by-Step Solution:

1. **Identify Given Values:**
- Length of the solenoid (L) = 100 cm = 1 m
- Diameter of the solenoid = 2 cm (not directly needed for this calculation)
- Number of turns in the primary solenoid (N1) = 1000 turns
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