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

The correct answer is D, which is creating an electromagnet by wrapping an insulated wire around a ferromagnetic material and applying an electric current.

Step-by-step explanation:

Electromagnets are created by wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current. Therefore, the correct answer to the student's question is D. An electric current flowing through the wire creates a magnetic field around the ferromagnetic material like iron, which enhances the magnetism effect. This process does not simply apply a charge to the material or involve twisting the ferromagnetic material. It also does not require covering a present magnet with insulation or applying an alternating electrical current.

Answer 2

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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