Question

what is electro magnetic induction

Answer 1

When an induced current is produced because of voltage production (electromotive force) due to a changing magnetic field, it is called Electromagnetic Induction. 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.

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 measure a voltage in the circuit.

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Answer 2

Electromagnetic induction is a force across the magnetic field.

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