Question

An electromagnet is a device in which moving electric charges (current) in a coil of wire create a magnet. What’s one advantage of using electromagnets in devices? A Electromagnets have a strong, constant magnetic field. B Electromagnets are more powerful than permanent magnets. C Electromagnets don’t need a source of electricity to work. D Electromagnets can easily be turned on and off.

Answer 1

I think the correct answer from the choices listed above is option D. One advantage of using electromagnets in devices would be that electromagnets can easily be turned on and off. Hope this answers the question. Have a nice day.

Answer 2

Answer;

D Electromagnets can easily be turned on and off.

Explanation;

• Electromagnets are made by winding a wire through a magnetic material such as soft iron core making a coil, and then passing electric current through the coil thus making the soft iron core magnetic.
• The strength of the electromagnet depends on the number of coils and also the size of the electric current through the coil.
• Permanent or regular magnets on the other hand do not require power but depends on the type of material used to make it.
• Therefore, its advantageous to use electromagnets as compared to using permanent magnets since the strength of the electromagnet can be easily adjusted by regulating the amount of current flowing through the coils. Thus, the electromagnet can be adjusted for have different levels of magnetic fields.