Answers

The Brainliest Answer!
2014-05-10T11:09:29+05:30
There are many ways 
by heating 
by using an ac(alternating current)field
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by using the reverse method of electromagnet or method of solinoid
2014-05-10T15:11:00+05:30
By heating,by hitting or banging,using AC current method...
the best way is to use AC current method....!
there are many other ways also!
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