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