Question

differentiate between bar magnet and electromagnet

Answer 1

In an electromagnet the magnetic field is created through electric current in a wire-wound coil and strengthened by a soft-iron core. As soon as you turn off the power, the soft-iron core loses its magnetisation.

A permanent magnet is made of ferromagnetic material, which is magnetised by a strong external magnetic field. The magnetically hard material that is used keeps part of its magnetisation after the external magnetic field is turned off.

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Answer 2

Electromagnet ...
•Electromagnet is a temporary magnet.
•It can produce very strong magnetic field.
•The polarity of electromagnet can be changed.

Bar magnet....
•Bar magnet is permanent magnet.
•It exhibits magnetism for a long time even after the removal of the magnetising field.
•The polarity of permanent magnet cannot be changed.

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