Magnets
Characteristics of magnets
How to test the strength of a magnet
Forces
Attract
Repel
Magnetic materials
Iron
Nickel
Steel
Cobalt
Like poles
Unlike poles
Can be natural/man-made
Can be different shapes and sizes
Can be permanent(steel)/temporary(iron)
Has two poles
North pole & south pole
Magnetism is the strongest at the end of the poles
When at rest
Always points in north-south direction
Strength of magnetism
Not dependent on size
Loses its magnetism
Hammered
Dropped from a height
Heated
Not properly stored
Count the number of magnetic meterial attracted by the magnet
Strongest magnet will attract the most number of magnetic materials
How to make a magnet
Electrical magnet
Electromagnets
Iron :
Coil electrical wire
The greater that no of coils, then stronger the electromagnet
The greater the number of poles,the stronger the magnet
Same direction
Batteries
The more batteries used,the stronger the electromagnet
The more the number of coils ,the stronger the electromagnet
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Users of magnets
Hold objects in place
Lift object (scrapyard)
Show direction(compass)
Display images(television screens)
store information
Maglev train
medical equipment at hospitals
cause trains to float above the tracks and move forward eg Maglev trains in Germany, China and Japan
Temporary magnet