(iii) Explain why on average the power delivered to the inductor in one cycle is zero.

Explain why on average the power delivered to the inductor in one cycle is zero.

During the first quarter cycle, when current increases, work is done against the back e.m.f. The energy supplied by the source is stored in the magnetic field of the coil. During the second quarter cycle, as current begins to decay, the magnetic field begins to collapse and energy is returned to the source. The same process is repeated in the next half cycle. Hence the energy supplied in the cycle to the coil is zero.

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