Advantages of an electromagnet over a permanent magnet is:

Strength of an electromagnet is fixed and polarity of an electromagnet can be reversed

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Strength of an electromagnet can be varied and polarity of an electromagnet can be reversed

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Strength of an electromagnet can be varied and polarity of an electromagnet is fixed

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Strength of an electromagnet is fixed and also polarity of an electromagnet is fixed

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Solution

The correct option is B
Strength of an electromagnet can be varied and polarity of an electromagnet can be reversed

Strength of an electromagnet can be varied and polarity of an electromagnet can be reversed

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A

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