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Transformer works under principle of mutual induction. Voltage from a battery can be stepped up since it is d.c
works based on the principal of mutual induction. an alternating current is supplied to primary coil which I turn produces a changing and alternating flux that surrounds the p.coil. when the second coil (secondary coil) is brought close to it (p.coil) some portion of alternating flux link with s.coil . as the flux is continuously changing there is also a changing flux linkage in the s.coil hence flow of current