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You have been provided with a solenoid A...

You have been provided with a solenoid AB.
Give one advantage of an electromagnet over a permanent magnet.

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The strength of the magnetic field of an electromagnet can be changed according to its use and it will be a magnet till the time current passes through it whereas, the strength of permanent magnet can not be increased and can not be magnetized and demagnetized in an instance.
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ICSE-SAMPLE PAPER 2013-SECTION-II
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