A bar magnet of pole strength 10A-m is cut into two equal parts breathwise. The pole strength of each magnet is

Options

A. 5A-m
B. 10A-m
C. 15A
D. 15A-m

Explanation

To solve the problem of finding the pole strength of each magnet after cutting a bar magnet of pole strength 10 A-m into two equal parts breadthwise, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Problem**:
- We have a bar magnet with a pole strength of 10 A-m.
- The magnet is cut into two equal parts breadthwise.

2. **Definition of Pole Strength**:
- Pole strength (denoted as 'm') is a measure of the strength of the magnetic poles of a magnet. It is defined as the strength of the magnetic field produced by the poles.

3. **Effect of Cutting the Magnet**:
- When a bar magnet is cut into two equal parts, each part will have its own north and south pole.
- Cutting the magnet breadthwise means that the length of each new magnet will be half of the original magnet.

4. **Analyzing the Pole Strength**:
- The pole strength of a magnet does not depend on its length. It is a property that remains constant as long as the material and the cross-sectional area remain unchanged.
- Since the cross-sectional area of each half remains the same as the original magnet, the pole strength of each new magnet will also remain the same.

5. **Conclusion**:
- Therefore, the pole strength of each of the two new magnets formed after cutting the original magnet will still be 10 A-m.

### Final Answer:
The pole strength of each magnet after cutting is **10 A-m**.

---