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Faraday's law of electromagnetic induction [itex]e=Nd\varphi/dt[/itex] explains the way of

electromagnetic energy conversions. The induced voltage is always ac because the rate of change of flux is needed.As in transformer we give ac voltage and the induced emf in the coil is also ac . In dc motor though we apply

**dc**supply voltage but again the induced emf/back emf/motional emf is

**ac**? Am I right?

Thanks for any replies.