Discussion
In parallel resonance, the phase angle between applied voltage and line current is :
Answer: B
At parallel resonance the phase angle is zero.
In a parallel resonant (tank) circuit the reactive current in the inductive branch is exactly cancelled by the reactive current in the capacitive branch. The line current is then only the small in-phase component that supplies the losses, so it is in phase with the applied voltage, the power factor is unity and the circuit's impedance is a maximum and purely resistive.
A phase angle of 90° belongs to a purely inductive or capacitive circuit, 45° to a circuit whose resistance equals its net reactance, and 180° does not arise in a passive circuit.
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