Assertion : In a purely inductive or capacitive circuit, the current is referred to as wattless currents.
Reason : No power is dissipated in a purely inductive or capacitive circuit even though a current is flowing in the circuit.

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, we need to analyze the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that in a purely inductive or capacitive circuit, the current is referred to as wattless currents.
- Wattless currents are defined as currents that do not result in power dissipation in the circuit.

**Hint**: Recall the definition of wattless currents and their significance in AC circuits.

2. **Understanding the Reason**:
- The reason provided states that no power is dissipated in a purely inductive or capacitive circuit, even though a current is flowing in the circuit.
- In AC circuits, power (P) is given by the formula:
\[ P = V_{\text{rms}} I_{\text{rms}} \cos \phi \]
- Here, \(\phi\) is the phase angle between the voltage and current.

**Hint**: Consider how the phase angle affects power dissipation in inductive and capacitive circuits.

3. **Analyzing Power in Purely Inductive and Capacitive Circuits**:
- In a purely inductive circuit, the current lags the voltage by \(90^\circ\) (or \(\frac{\pi}{2}\) radians), which means \(\cos(\frac{\pi}{2}) = 0\).
- In a purely capacitive circuit, the current leads the voltage by \(90^\circ\) (or \(\frac{\pi}{2}\) radians), which also results in \(\cos(\frac{\pi}{2}) = 0\).
- Therefore, substituting \(\phi = \frac{\pi}{2}\) in the power formula gives:
\[ P = V_{\text{rms}} I_{\text{rms}} \cdot 0 = 0 \]
- This indicates that no power is dissipated in these circuits.

**Hint**: Think about the implications of the phase relationship between current and voltage in determining power.

4. **Conclusion**:
- Since both the assertion and the reason are true, and the reason correctly explains the assertion, we conclude that:
- **Assertion**: True
- **Reason**: True and explains the assertion.

**Final Answer**: Both assertion and reason are true, and the reason is the correct explanation of the assertion.