What is a difference between the magnetic fields of a regular bar magnet and an electromagnet?

A. A bar magnet's field is temporary, but an electromagnet's is permanent.

B. A bar magnet's field is permanent, but an electromagnet's is temporary.

C. A bar magnet is made of iron, but an electromagnet is made of plastic.

D. There is always an electric current flowing around an electromagnet.

Question

Physics

Cullen Bass

12 October, 06:11

What is a difference between the magnetic fields of a regular bar magnet and an electromagnet?

A. A bar magnet's field is temporary, but an electromagnet's is permanent.

B. A bar magnet's field is permanent, but an electromagnet's is temporary.

C. A bar magnet is made of iron, but an electromagnet is made of plastic.

D. There is always an electric current flowing around an electromagnet.

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Answers (1)

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Vanessa Stuart · Answer 1

B. A bar magnet's field is permanent, but an electromagnet's is temporary.

A bar magnet has a permanent magnetic field which has a constant strength and cannot be varied. On the other hand, an electromagnet is one in which magnetism is induced temporarily and strength of magnetic field can vary depending on a number of factors. When current passing through coils of wire in an electromagnet stops, the electromagnet also does not act as a magnet anymore