Question

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In order to create an electromagnet, you would

A. apply a charge to a non–magnetic material in order to create an electromagnetic field.
B. coil a ferromagnetic material, wrap in an insulator, and apply a direct current to the coil.
C. cover a wire with insulation and apply an alternating electrical current to the magnet.
D. wrap an insulated wire around a metal with ferromagnetic properties and apply an electric current.

Answer 1

The answer is D

Step-by-step explanation:

I took the test

Answer 2

D. Wrap an insulated wire around a metal with ferromagnetic properties and apply an electric current.

The magnetic field is turned off when an induced current is not present.

Thus, an electromagnet would act as a magnet only when a current is induced in an insulated wire that is wrapped around a material of ferromagnetic material such as iron core rotating in a magnetic field.