Electromagnet is based on :-
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An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the centre of the coil.
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The strength of an electromagnet is based on the coils of Wire or strength of the battery
it is basically based on electricity.
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