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 semi-circular arc, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Magnetic Moment (M)**:
- The magnetic moment of a wire is defined as the product of the current flowing through the wire (I) and the length of the wire (L) multiplied by a constant that depends on the geometry of the wire.
- For a straight wire, the magnetic moment is given as \( M = I \cdot L \).

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