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?

1.Electromagnets have a strong, constant magnetic field.



2.Electromagnets are more powerful than permanent magnets.



3.Electromagnets don’t need a source of electricity to work.



4.Electromagnets can easily be turned on and off.

Answer 1

The main advantage of Electromagnets is that they can easily be turned on and off.

In short, Your Answer would be Option 4

Hope this helps!