Question

What is EMF ? And explain it

Answer 1

Electromotive force, abbreviated emf(denoted and measured in volts), is the electrical intensity or "pressure" developed by a source of electrical energy such as a battery or generator. ... This potential difference can drive an electric current if an external circuit is attached to the terminals.

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Answer 2

ELECTROMAGNETIC FIELD 

An electromagnetic field is a physical field produced by electrically charged objects. It affects the behavior of charged objects in the vicinity of the field.