JEE Main · 2022 · 25 Jun 2022 · Shift 1 · Alternating Current

Wattless current means the average power consumed is zero. This occurs when the current and voltage are 90° out of phase ($\theta =\pi /2$).

Average power: $P_{\text{avg}}=V_{\text{rms}}{I}_{\text{rms}}\cos \theta$

For wattless current: $\cos (\pi /2)=0$, so $P_{\text{avg}}=0$.

This condition is satisfied in a purely inductive circuit (or purely capacitive circuit), where the phase difference between voltage and current is exactly 90°.

Answer: (B)