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

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9 March, 14:30

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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Kaya · 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