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why DC current not used in Transformer action?
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Answer Posted / bin
transformer secondary coil produced emf depends on change in magnetic flux in the circuit.according to Faraday's law of electromagnetic induction says that emf= -n d(Q)/d (t). where Q=flux.so in dc circuit frequency is not produced.so flux is not produced hence no change in flux.i.e. emf=0. even after some times coil may be burnt due dc supply running.
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