Question

give three points of difference between an Electromagnet and permanent magnet

Answer 1

the strength of electromagnet can be changed but not of permanent magnet
the polarity at the ends of electromagnet can be reversed but not of permanent magnet
electromagnet is a temporary magnet whose magnetism can be switched on and off whereas it is not with the case of permanent magnet

Answer 2

The differences between permanent magnet and electromagnet are as follows :-

⇒ The permanent magnet does not have electric current flow through it.

⇒ Electromagnets are made by passing electric current through it.

⇒ The strength of the magnetic field in permanent magnets cannot be changed.

⇒ The strength of the electromagnets can be changed by changing the amount of current in the magnet.

⇒ The direction of the magnetic field cannot be changed.

⇒ The direction of magnetic field can be changed in electromagnets.

⇒ The polarity of permanent magnets cannot be changed.

⇒ The polarity of the electromagnets can be changed.

⇒ The permanent magnet is generally made of hard iron.

⇒ The electromagnets are generally made of soft iron.