(1) Electromagnet is made of soft iron while permanent magnet is made of steel.
(2) The poles of an electromagnet can be reversed by but the poles of a permanent magnet cannot be reversed.
(3) An electromagnet produces a magnetic field as long as the current flows in the wire while a permanent magnet produces a permanent magnetic field.
(4) The strength of the magnetic field in an electromagnet can be changed. In a permanent magnet the strength of the magnetic field cannot be changed.