Assertion : When both the strips of electroscope is charged with similar charge, they repel each other and become wide open.
Reason : Like charges always repel each other.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer

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

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that when both strips of an electroscope are charged with similar charges, they repel each other and become wide open.
- An electroscope consists of two metal strips that can move apart when charged.

2. **Understanding the Reason**:
- The reason states that like charges always repel each other.
- This is a fundamental principle of electrostatics: charges that are the same (both positive or both negative) will repel each other.

3. **Analyzing the Assertion**:
- If both strips of the electroscope are charged with the same type of charge (either both positive or both negative), they will indeed repel each other.
- This repulsion causes the strips to move apart, leading to the electroscope opening wide.

4. **Analyzing the Reason**:
- The reason provided is correct as it aligns with the established scientific principle that like charges repel each other.

5. **Conclusion**:
- Both the assertion and the reason are true.
- Furthermore, the reason correctly explains the assertion.

### Final Answer:
- **Assertion**: True
- **Reason**: True
- **Explanation**: The reason is the correct explanation of the assertion.