If wattless current flows in the AC circuit, then the circuit is: (a) Purely Resistive circuit (b) Purely Inductive circuit (c) LCR series circuit (d) RC series circuit only

Answer: (b). Wattless current flows when φ = 90°, so P = VrmsIrmscos 90° = 0. This happens in a purely inductive (or purely capacitive) circuit. Resistive, LCR and RC circuits all have cos φ ≠ 0. So the answer is (b) purely inductive circuit.

If wattless current flows in the AC circuit, then the circuit is: | JEE Main 2022 (25 Jun, Shift 1)

Q51JEE Main 2022 · 25 JUN · SHIFT 1Easy

Power, Power Factor & Wattless Current

If wattless current flows in the AC circuit, then the circuit is:

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Answer: (b)

Wattless current flows when $\phi = 90^\circ$ , so $P = V_{rms}I_{rms}\cos 90^\circ = 0$ .
This happens in a purely inductive (or purely capacitive) circuit.
Resistive, LCR and RC circuits all have $\cos\phi \ne 0$ .
So the answer is (b) purely inductive circuit.

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