Which of the following is a disadvantage of an electromagnet compared to a bar magnet?

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An electromagnet is much more powerful than a bar magnet

Magnetisation can be controlled in the case of an electromagnet

The magnetisation is temporary in an electromagnet and permanent in a bar magnet

None of these

answer is C.

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Detailed Solution

The magnetisation is temporary in an electromagnet and permanent in a bar magnet.
The electromagnets are more powerful than a bar magnet. The power of magnetisation can be varied according to the application. The disadvantage of an electromagnet compared to a bar magnet is that an electromagnet continuously requires a supply of electric current passing through the coil to function properly. Hence, An electromagnet loses magnetisation as the power supply is cut off.

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