Electromagnetism is essentially magnetism that comes about due to an electric current. When a current flows through a conducting wire a magnetic field is produced around the wire. The strength of the magnetic field depends on the current through the wire and, like before, the distance from the wire.


A solenoid is a coil of wire and the magnetic field takes a similar shape to that of a bar magnet.

Electromagnetism, figure 1

If an iron core was added inside the coils then the magnetic strength would increase. In addition, increasing the number of coils or the current would also increase the magnetic field.

An electromagnet is a solenoid with an iron core.

Name three things that can be done to increase the magnetic field around an electromagnet.
Your answer should include: Increase / Number / Coils / Large / Core / Current
What is the shape of magnetic field around an electromagnet?
Your answer should include: Same / Bar / Magnet
Explanation: Same as bar magnet.