What Do Magnets Do?

iron
steel
nickel
cobalt

On a bar magnet the poles are at either end of the magnet. Poles occur in pairs of equal strength.

Other pole - South - S pole

Unlike poles attract

Test for a Magnet

A permanent magnet causes repulsion with one pole when the poles are brought in turn near a suspended magnet.

An unmagnetised magnet material would be attracted to both poles.

Repulsion is the only sure test for a magnet

Just think about the effect of the Earth's magnetic field on a compass needle.

Contents

History of magnetism, What is a magnet
Magnetic fields
The Earth's magnetic field
Theory of magnetism
Induced magnetism
Magnetic properties of iron and steel
Storing magnets
Making a magnet
Electro-magnets
Primary science applications
Fleming's Left Hand Rule
Self assessment
Comments, reflections and study action plan