Assertion : The capacitive reactance limits the amplitude of the current in a purely capacitive circuit.
Reason : Capacitive reactance is proportional to the frequency and the capacitance.

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

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "the capacitive reactance limits the amplitude of the current in a purely capacitive circuit."
- In a purely capacitive circuit, the current (I) is related to the voltage (V) and the capacitive reactance (Xc) by the formula:
\[ I = \frac{V}{X_c} \]
- Since Xc is a measure of how much the capacitor resists the flow of current, a higher capacitive reactance will result in a lower current amplitude. Therefore, this assertion is **true**.

2. **Understanding the Reason**:
- The reason states that "capacitive reactance is proportional to the frequency and the capacitance."
- Capacitive reactance (Xc) is given by the formula:
\[ X_c = \frac{1}{\omega C} = \frac{1}{2\pi f C} \]
- From this formula, we can see that Xc is **inversely** proportional to both the frequency (f) and the capacitance (C). This means that as frequency increases, capacitive reactance decreases, and vice versa. Therefore, this reason is **false**.

3. **Conclusion**:
- Since the assertion is true and the reason is false, we conclude that the correct answer is that the assertion is true but the reason is false.

### Final Answer:
- The assertion is true, but the reason is false.