A bar magnet is a permanent magnet. An electromagnet is a temporary magnet. ... The strength of the magnetic field produced by a bar magnet is constant. The strength of the magnetic field produced by an electromagnetic can be varied, depending on the current that passes through the winding or the number of turns.
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A bar magnet is a permanent magnet. An electromagnet is a temporary magnet. ... The strength of the magnetic field produced by a bar magnet is constant. The strength of the magnetic field produced by an electromagnetic can be varied, depending on the current that passes through the winding or the number of turns.