Asked by  | 21st Mar, 2008, 05:00: AM

Expert Answer:

Electromagnet stops behaving as magnet as soon as source of magnetism (electricity) is removed where as permanent magnet behave as a magnet for ever.

If steel is used as core material instaed of iron then it makes permanent magnet.




Answered by  | 22nd Mar, 2008, 02:40: AM

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