Transformer works on ______ principle.

A. Gauss’s law
B. Fleming’s right-hand rule
C. Faraday’s law of electromagnetic induction 
D. Fleming’s left-hand rule

Answer 
C. Faraday’s law of electromagnetic induction

Explanation 
  • A transformer consists of two electrically isolated coils and operates on Faraday's principle of “mutual induction”, in which an EMF is induced in the transformer secondary coil by the magnetic flux generated by the voltages and currents flowing in the primary coil winding.
  • Mutual induction is defined as the property of the coils that enables it to oppose the changes in the current in another coil. With a change in the current of one coil, the flow changes too thus inducing EMF in the other coil. This phenomenon is known as mutual induction.
  • Faraday’s law of electromagnetic induction states that the magnitude of voltage is directly proportional to the rate of change of flux

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