Which one of the following statements is true about electromagnets
1.in these magnets permanentpermanent magnets are used second this magnets are permanent magnets third natural magnets are more powerful than the electromagnetic forth this magnets work only when electric current is passed through them
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Answer:
right answer if option forth
Explanation:
Electomagnets behaves like a magnet when the electricity is pass through it these magnets are not permanent and if high voltage of current is pass through the electomagnet its power increases
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