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

### Step-by-Step Solution:

1. **Understand the Initial Condition**:
- We have a bar magnet with an initial pole strength \( P = 10 \, \text{A-m} \).

2. **Cutting the Magnet**:
- The bar magnet is cut into two equal parts breadthwise. This means we are dividing the magnet into two halves along its width.

3. **Effect on Pole Strength**:
- When a bar magnet is cut into two equal parts, the pole strength of each part will be affected. The pole strength of a magnet is defined as the strength of its magnetic poles.

4. **Calculate New Pole Strength**:
- When the magnet is cut breadthwise, each half will have half the pole strength of the original magnet. Therefore, the pole strength of each new magnet will be:
\[ P' = \frac{P}{2} = \frac{10 \, \text{A-m}}{2} = 5 \, \text{A-m} \]

5. **Conclusion**:
- Each of the two new magnets will have a pole strength of \( 5 \, \text{A-m} \).

### Final Answer:
The pole strength of each magnet after cutting is \( 5 \, \text{A-m} \).

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