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(B) The working principle of a transformer is based on Faraday's law of electromagnetic induction.When an alternating current flows through the primar

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$A$ varying magnetic field

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(B) The working principle of a transformer is based on Faraday's law of electromagnetic induction.When an alternating current flows through the primary coil,it produces a time-varying magnetic flux.This magnetic flux is linked to the secondary coil through the iron core.According to Faraday's law,a change in magnetic flux induces an electromotive force $(EMF)$ or voltage in the secondary coil.Therefore,the alternating voltage induced in the secondary coil is primarily due to the varying magnetic field.

The alternating voltage induced in the secondary coil of a transformer is mainly due to

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