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COMEDK20269 May 2026Morning ShiftPhysicsAlternating CurrentActual

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

Options

  1. ALR circuit
  2. BPurely capacitive circuit
  3. CPurely resistive circuit
  4. DLCR circuit

Correct answer

B. Purely capacitive circuit

Step-by-step solution

The average power dissipated in an AC circuit is given by P = V_ rms I_ rms , where is the phase difference between the voltage and the current. For wattless current, the average power dissipated must be zero, which means P = 0 . This implies = 0 , so the phase difference = 2 or - 2 . A phase difference of 2 occurs only in purely inductive or purely capacitive circuits. In a purely capacitive circuit, the current leads the voltage by exactly 2 , making the power factor zero. Therefore, wattless current flows in a p

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