State whether the following statements are true or false?

The advantages of electromagnets over permanent magnets is:

We can change the strength of the magnetic field of an electromagnet by varying current. We can either increase or decrease its strength. This is not possible in case of permanent magnets.

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True

False

answer is A.

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Detailed Solution

The given statement is true.
Concept- The strength of an electromagnet varies, whereas the strength of a permanent magnet remains constant.
The advantages of electromagnets over permanent magnets are as follows:
1. We may modify the strength of an electromagnet's magnetic field by varying current. We have the option of increasing or decreasing its strength. In the case of permanent magnets, this is not possible.
2. It is simpler to produce an electromagnet.
3. Electromagnets have greater magnetic power than permanent magnets.
Hence, the given statement is true.

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