The transformer works on which of the following principles?

Electro-magnetic induction

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Electro-magnetic repulsion

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Electro-magnetic attraction

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Electro-magnetic conduction

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Solution

The correct option is A Electro-magnetic induction
In a transformer, voltage (or electrical energy) is changed from one value to another by principles of electromagnetic induction in the form of mutual induction. When an alternating voltage is applied to the primary coil the resulting current will cause the production of continuously varying magnetic flux. Due to mutual induction, induced EMF is produced in the secondary coil.

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