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Under what conditions a permanent electo...

Under what conditions a permanent electormagnet is obtained if a current carrying solenoid is used? Support your answer with the help of a labelled circuit diagram.

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The conditions to obtain permanent electromagnet as following if a current carrying solenoid is used are
(i) The current through the solenoid should be direct current.
(ii) The rod inside is made of a magnetic material such as steel.
(iii) The magnetic material should be of high retentivity and should not lose it easily.
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