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Magnets - Coggle Diagram
Magnets
Magnetic Material
A magnet
is able to attract
a magnetic material
Lodestones
are magnets
that exist naturally in nature
Types
Steel
Cobalt
Iron
Nickel
Non-magnetic material
is a material
that cannot be attracted by magnet
Characteristics of Magnets
Types of Magnets
Horseshoe magnet
Bar magnet
Ring magnet
U-shaped magnet
Poles of Magnets
North pole
South pole
Magnetism of magnets is strongest
at poles
A magnet
when suspended freely in the air
always comes to rest
in the north-south direction
The magnetism of a magnet
can pass through
a non-magnetic material
and attract a magnetic material
cannot pass through
a magnetic material
as the magnet
will attract
the magnetic material
Making Magnets
Induction
When an iron nail is brought near a magnet
The iron nail will be attracted to the magnet
And will be magnetised
The iron nail is induced to be a temporary magnet
The iron nail can attract another
When magnet is removed from contact with iron nail
Iron nail will lose magnetism
Electricity (Electromagnet)
Wire is coiled around a magnetic material
When electricity is turned on
Magnetic material turns into an electromagnet
Increasing strength of electromagnet
Increase the number of coils of wire around the magnetic material
Increase the number of batteries in the circuit
Temporary magnet
An electromagnet is a temporary magnet
When electricity in the circuit is turned off
The electromagnet will lose its magnetism and become a normal magnetic material
Stroking
1 stroking magnet
Must
Stroke with same pole
Stroke in the same direction
All the time
If the permanent magnet
Strokes the magnetic material
In changing directions
Changing stroking poles
The magnet will not be magnetised
2 stroking magnets
Stroking pole in each magnet must be opposite
Stroke the magnetic material in opposite directions
Strength of magnet
Will be affected
By the number of times a permanent magnet strokes it
Poles produced at the end of the stroking
Where permanent magnet stops stroking the magnet
And is not in contact with the magnetic material anymore
Leaves the magnetic material
This pole
is opposite to
the stroking pole on the permanent magnet used
Ways to Demagnetize A Magnet
Heating
Hammering
Dropping from A Height
Testing for Magnets, Magnetic and Non-magnetic materials
Testing for Magnets
We can only determine if a magnetic material is a magnet if it
Is attracted to one pole of a magnet
Repels the other pole of a magnet
Testing for Magnetic Materials
We can only determine if a material is a magnetic material if it
Is attracted to both poles of magnet and repels none
Testing for Non-magnetic materials
We can only determine if a material is a non-magnetic material if it
Is not attracted
Does not repel
Any pole of a magnet
Interaction of Poles
When like poles
face each other
they repel
REPULSION
When unlike poles
face each other
they attract
ATTRACTION
Types of Magnets
Permanent Magnet
can retain magnetism for a long time
made of steel
Temporary Magnet
can only retain magnetism for a short time
made of iron