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8 March, 19:54

How is an electromagnet different from a bar magnet?

A) Bar magnets have a north and south pole, but electromagnets do not.

B) Electromagnets are strong, permanent magnets, but bar magnets are always weaker.

C) Electromagnets are only magnetized when a current flows through a wire wrapped around the core.

Eliminate

D) Bar magnets are attracted to ferromagnetic substances such as iron. Electromagnets are attracted to all metals.

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Answers (2)
  1. 8 March, 20:44
    0
    a i think sorry if its wrong
  2. 8 March, 20:52
    0
    C) Electromagnets are only magnetized when a current flows through a wire wrapped around the core.

    Explanation:

    An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet (bar magnet), amount of electric current that flows through electromagnet changes the strength of an electromagnet. The poles of an electromagnet are determined by flow of electricity.
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