Answer :

The diagram is shown below:


i. In a transformer, the AC voltage applied to the primary coil produces a varying magnetic field.


ii. By electromagnetic induction, an emf is induced in the primary. The change of flux in the primary coil is linked with the secondary.


iii. Hence an emf is induced in the secondary coil as well.


iv. Thus the emf induced in each turn of the primary coil and secondary coil will be same.


v. In this way, the voltage across the primary coil is stepped up or stepped down depending on the turns ratio of the primary and secondary coils.


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