What are the advantages of electromagnet over permanent magnet?

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Strong magnetic field is produced by an electromagnet.

The polarity of an electromagnet can be reversed by sending the current in the reverse direction

The magnetic strength of electromagnets can either be increased or decreased but this cannot be done in permanent magnets.

All of the above

answer is D.

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Detailed Solution

Concept: A permanent magnet produces a magnetic field on its own, whereas an electromagnet produces one temporarily as a result of the current passing through the wire around an iron core.
The major advantage of electromagnets is that they can control their attractive drag by turning the magnet on or off and changing the current. They too have a more grounded draw than changeless magnets. Agreeing to a few estimations, the greatest electromagnet is 20 times more effective than the foremost effective changeless magnet.
Hence, the correct answer is option 4.

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