A steel wire has a magmetic moment M. What will be its magnetic moment if it is bent into a semi-circular arc ?

Explanation

To find the magnetic moment of a steel wire when it is bent into a semicircular arc, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Initial Magnetic Moment**:
Let the initial magnetic moment of the steel wire be \( M \). The wire has a length \( L \).

2. **Determine the Circumference of the Semicircle**:
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