Question

Electromagnets are created by

A. applying a charge to a magnetic material, wrapped in an insulator, which creates an electromagnetic field around the magnet.

B. covering a magnet with insulation and applying an alternating electrical current to the magnet.

C. twisting a ferromagnetic material, wrapping in an insulator, and applying a direct current to the coil.

D. wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

Answer 1

I electromagnets, the magnetic field is turned off when there is no induced current. So, electromagnets act as magnets only when current is induced in an insulated wire wrapped around a material mage of ferromagnetic material such as iron core rotating in a magnetic field.

So, option D is the correct one.



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Answer 2

Electromagnets are created by wrapping a ferromagnetic wire around an insulator, and applying a direct current to the coil. Option C is correct.

Electromagnets:

It is a type of magnet that is made from the electric current.

To prepare an electromagnet, the ferromagnetic wire such as copper wire is wrapped around an insulator.

When electricity run in the wire this also produce magnetic field around the wire.

Therefore, electromagnets are created by wrapping a ferromagnetic wire around an insulator, and applying a direct current to the coil.

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