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Magnets - Coggle Diagram
Magnets
Characteristic of magnets
Have different shapes and sizes
U-shaped magnet
Horseshoe magnet
Bar magnet
Ring magnet
All magnets have two ends called poles
South-Pole
North-Pole
Strongest at its poles and weakest when further away from the poles
The two opposite poles of magnet can exert a magnetic force on other magnets or magnetic materials
Like poles of two magnets facing each other repel
Unlike poles of two magnets facing each other attracts
The size of magnet does not affect their magnetism.
Types of magnets
A magnetic material can be made into either a permanent magnet or a temporary magnet in a few days
Permanent Magnets that can retain its magnetism for a long time
Magnets made of steel
Temporary magnets can only retain their magnetism for a short time
Type of magnet is made of iron
Making a magnet from magnetic materials
Induction
The iron nail will now be able to attract another nail.
When magnet is removed, the iron nail will lose its magnetism. Hence will not be able to attract each other anymore.
When a magnet is brought near an iron nail, the iron nail will ne attracted to magnet and becomes magnetised.
Using electricity
An iron nail is coiled around by electrical wire
The iron nail will become a magnet when electricity is turned on. The magnet made in this method is called electromagnet
Increase number or coils around nail or amount of electricity to increase the strength of the electromagnet
Stroking method
Stroke in one direction from one end to the other
Stroke with same stroking pole all time
Iron rod, steel bar etc., can make into a magnet by stroking with either one or two permanent magnets
Demagnetiase a magnet
Heating
Hammering
Dropping
Material
Magnetic material
The attraction of a magnet is called magnetism
Lodestones are magnets that exists naturally in nature. Other magnets can be man-made from magnetic materials
A magnet is able to attract a magnetic material
Cobalt
Steel
NIckel
Iron
No fixed S pole and no fixed N pole
Non- Magnetic
Pastic
Glass
Wood
Rubber
Clay
Has no poles
Cannot
Repel
Attract
Two types of magnetic force
Attraction
Repulsion
Distance between a magnet and a magnetic material affects the strength of attraction
Stronger attraction by magnet when closer
A magnetic material experiences a weaker attraction by a magnet when further away