Electromagnet | Permanent Magnet |
(1) It is a temporary magnet- it ceases to exist as soon as the current passing through it is stopped. | It does not lose its magnetism so quickly, that is why it is called a permanent magnet. |
(2) The polarity can be reversed readily by reversing the direction of the current. | The polarity of a permanent magnet cannot be reversed. |
(3) The strength of the magnetic field produced by an electromagnet can be increased or decreased without bodily shifting the magnet, by adjusting the current. | The strength of the magnetic field produced by a permanent magnet at a given point can not be changed without bodily shifting the magnet. |
(4) An electromagnet can produce intense magnetic fields. | A permanent magnet cannot produce a very strong magnetic field. |
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