a. What is the magnetic flux through one turn of a solenoid of self inductance `8.0xx10^-5H` when a current of `3.0 A` flows throgh it? Assume that the solemoid has 1000 turns ans is wound from wire of diameter `1.0 mm`.
b. What is the cross sectional area of the solenoid?

Explanation

To solve the problem step by step, we will address both parts of the question sequentially.

### Part a: Finding the Magnetic Flux

1. **Identify the given values**:
- Self-inductance, \( L = 8.0 \times 10^{-5} \, \text{H} \)
- Current, \( I = 3.0 \, \text{A} \)
- Number of turns, \( N = 1000 \)
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