Assertion: The poles of magnet cannot be separated by breaking into two pieces.
Reason: The magnetic moment will be reduced to half when a magnet is broken into two equal pieces.

Options

A. If both Assertain and Reason are true and Reason is the correct explanation of Assertain
B. If both Assertain and Reason are true but Reason is not correct explantion of Assertain
C. If Assertion is true but Reason is false
D. If Assertion is false but Reason in true.

Explanation

To solve the question, we will analyze both the assertion and the reason provided.

### Step-by-step Solution:

1. **Understanding the Assertion**:
- The assertion states that "The poles of a magnet cannot be separated by breaking it into two pieces."
- This is based on the fundamental property of magnets. A magnet has two poles: a North pole and a South pole. When a magnet is broken, each piece will still have both a North and a South pole. Therefore, it is true that the poles cannot be separated.

2. **Understanding the Reason**:
- The reason states that "The magnetic moment will be reduced to half when a magnet is broken into two equal pieces."
- The magnetic moment (M) of a magnet is a measure of its strength and orientation in a magnetic field. When a magnet is broken into two equal pieces, each piece will have a magnetic moment that is half of the original magnet's magnetic moment. This is because the magnetic moment is proportional to the length of the magnet, and breaking it in half reduces the length.

3. **Evaluating the Truth of Each Statement**:
- Both the assertion and the reason are true statements.
- However, the reason provided does not explain why the poles cannot be separated. It merely states a fact about the magnetic moment.

4. **Conclusion**:
- The assertion is true: the poles cannot be separated.
- The reason is also true: the magnetic moment is halved when a magnet is broken.
- However, the reason does not correctly explain the assertion.

5. **Final Answer**:
- The correct option is that both the assertion and the reason are true, but the reason is not the correct explanation for the assertion.