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Rev. Notes > IGCSE > Simple phenomenon of magnetism
 
 
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Topics
 
Properties of magnets Basic cause of magnetism Properties of magnetic lines of forces
Ferus and non-ferus materials Methods of magnetisations Methods of demagnetisations
Experiment - pattern of magnetic lines of forces arround a bar magnet Properties of magnetic lines of forces Magnetic properties of iron and steel
Design and use of permanent and electromagnets
 

Basic cause of magnetism

In an atom tiny electrical particles called electrons move arround a central nucleus.

Each electron has a magnetic effect as it spins and orbits the nucleus.

In many types of atom , the magnetic effects of the electrons cancel, but in some they do not, so each atom acts as a tiny magnet.

In an unmagnetised material, the atomic magnets point in random direction.

But as the material becomes magnetised, more and more of its atomic magnets line up with each other.

Together, billions of tiny atomic magnets act as one big magnet.

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