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What is the principle of the transformer?

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What is the principle of the transformer?

(a) Gauss law

(b) Coulomb’s law

(c) Electromagnetic induction

(d) Ampere’s law

I have been asked this question in homework.

Question is taken from Magnitude of the Generated or Induced EMF topic in chapter Electromagnetism of Basic Electrical Engineering

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Right option is (c) Electromagnetic induction

To elaborate: In transformer, flux in secondary coil change due to current in the primary coil and hence current get induced in secondary coil.

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