Assertion : An alternating current does not show any magnetic effect.
Reason : Alternating current does not vary with time.

Options

A. If both assertion ans reason are true ans reaason 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 istrue but reason is false.
D. If both assertion and reason are false.

Explanation

To solve the question regarding the assertion and reason about alternating current (AC), we will analyze both statements step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "An alternating current does not show any magnetic effect."
- This statement is incorrect. Alternating current does produce a magnetic effect because it involves moving charges. The magnetic field is generated by the flow of current, regardless of whether it is alternating or direct.

2. **Understanding the Reason**:
- The reason states that "Alternating current does not vary with time."
- This statement is also incorrect. Alternating current is characterized by its continuous variation in both magnitude and direction over time. This is typically represented by a sine wave, which clearly shows that both the current and voltage change with time.

3. **Conclusion**:
- Since both the assertion and the reason are incorrect, we conclude that the assertion is false and the reason is also false.

4. **Final Answer**:
- Therefore, the correct answer is that both the assertion and reason are false.