The strength of the magnetic field of an electromagnet :

is always greater than that of a permanent magnet

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is always less than that of a permanent magnet

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can be adjusted

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none of the above

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Solution

The correct option is C can be adjusted
The strength of magnetic field of electromagnetic can be adjusted by changing the current passing through it.

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Similar questions

In certain applications, electromagnets are better than permanent magnets because:
(more than one answers can be correct)

Which kind of magnet can be stronger than a permanent magnet?

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