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Is it true that any magnetic field induces an emf in a loop of wire? If It it is true then kindly explain me with an example

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You ask:

Is it true that any magnetic field induces an emf in a loop of wire?

No, not in any setup. Only if there is a change in the magnetic lines passing through a loop. It is how electric generators work.

Here is a simple example of a loop in a changing magnetic field.

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