Which of the following statement is true about electromagnets 1]in these magnets permanent magnet are used 2)these magnets are permanent magnet 3)natural magnet are more powerful than electromagnets 4)these magnet work only when electric current passed through them
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Hey friend....
According to me the fourth one ( these magnet work only when electric current passed through them) is true.
Hope it helps.
According to me the fourth one ( these magnet work only when electric current passed through them) is true.
Hope it helps.
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