Magnetic Properties of Iron and Steel

Chains of paper clips can be hung from a magnet.

Each paper clip magnetises the one below it by induction and the unlike poles so formed attract.

If top paper clip is removed the chain collapses -

Magnetism induced in
iron is temporary (SOFT)

steel chain it does not
collapse -
Magnetism induced in
steel is permanent (HARD)

Strings of papers clips

Contents

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