An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets are used in a variety of devices, including electric motors, generators, and MRI machines.
Electromagnets are created by wrapping a coil of wire around a magnetic core and passing an electric current through the wire. The magnetic field produced by the current flowing through the wire creates a magnetic field around the coil, effectively turning the coil into a magnet.
The strength of an electromagnet depends on several factors:
Electromagnets have numerous applications, including: