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Magnetism
Magnetism…What is it
 A force of attraction (Pull) and repulsion
(Push)
 Domain:region where atoms are aligned
 In a magnet most domains are aligned
 The more domains that are aligned, the
stronger the magnet
The Law of Magnetic Poles
 Like poles repel
 Opposite poles attract
 All magnets have two poles
 North and South
 If you break or cut a magnet it will
still have two poles
 Magnetic force is the strongest at
poles and both poles are of equal
strength
Making Magnets
 Only iron, nickel, cobalt and steel can be
magnetized (CINS)
 You make magnets by aligning the domains
 Stroke iron, cobalt, nickel or steel
 In one direction with a magnet
 The more you stroke the stronger the
magnet b/c the domains are aligned
 Place iron, cobalt, nickel or steel in a
strong magnetic field
Demagnetizing a Magnet
Bang it
Drop it
Heat it
Stroke in two directions
Over time a temporary magnet
will lose magnetism