Question

define electromagnetic induction​

Answer 1

When electricity passes through a magnetic material, it gets the magnetism. If you loop the wire around the material, you can get a better induction.

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Answer 2

Electromagnetic Induction is a current produced because of voltage production (electromotive force) due to a changing magnetic field. This either happens when a conductor is placed in a moving magnetic field (when using AC power source) or when a conductor is constantly moving in a stationary magnetic field.
More information........

This phenomenon was discovered by Michael Faraday. He arranged a conducting wire as per the setup given below, attached to a device to measure the voltage across the circuit. When a bar magnet was moved through the coiling, the voltage detector measures voltage in the circuit.

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