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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
 

Methods of demagnetisations

Hammering:

If a magnet is hammered, its atomic magnets are thrown out of line: it becomes demagnetised.

Heating:

Heating a magnet to a high temperature also demagnetise it.

By using an alternating current:

It is the most efficient method of demagnetisation.

A magnet to be demagneised is placed inside a solenoid connected to an alternating current (a.c.) supply. 

The mgnet will be demagnetised when it is slowly removed from the solenoid with the alternating current flowing in it.

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