Electromagnets

by kellie zeilmann

What is an Electromagnet?

An electromagnet is a soft metal core made into a magnet by the passage of electric current through a coil surrounding it.

How does an Electromagnet Work?

An electromagnet works because an electric current produces a magnetic field. The magnetic field produced by an electric current forms circles around the electric current.

(from and explained in detail at http://education.jlab.org/qa/electromagnet_is.html !)

How Were Electromagnets Invented?

The very first electromagnet was a horseshoe-shaped piece of metal/iron that was wrapped with a loosely wound coil of wrapped around a few times. When a current was passed through the coil; the electromagnet became magnetized and when the current was stopped the coil was de-magnetized.

(More detail at http://inventors.about.com/library/inventors/blelectromagnet.htm !)

Who Invented Electromagnets?

William Sturgeon, in 1825.
Electromagnet -What is it ? For Kids

Electromagnets in Life

In microphones:
in motors:
in MRI scanners: