We know that in a pure inductive circuit, current lags behind voltage by 90 degrees (or, to put it another way, voltage leads current by 90 degrees), implying that the phase difference between current and voltage is 90 degrees.
There is no internal resistance in a pure inductor or pure capacitor. If the inductor or capacitor's internal resistance is zero, the voltage and current will always be 90 degrees out of phase. and thus, P=0. Even so, the circuit will have reactive power.
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