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Electromagnet |
Bar Magnet or Permanent Magnet |
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It is a temporary magnet |
It is a permanent magnet |
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They are usually made of soft materials |
They are usually made of hard materials |
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It can produce very strong magnetic force |
It produces comparatively weak magnetic force |
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It's magnetic strength can be changed |
It's magnetic strength can not be changed |
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It's polarity can be changed. |
It's polarity can not be changed. |
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Example - Solenoid - A wire wound across a nail connected to a battery |
Example - Bar Magnet |
