Magnets

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DIFFERENT MODELS AND MATERIAL

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Electrical Conductivity

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Primary 3 map

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Matter Unit 5

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Magnets

Making a temporary magnet

Using electricity

The electromagnet can now attract magnetic materials/objects. Only if it is connected to a source of electricity. When it is removed from the the source of electricity it no longer becomes an electromagnet.

Coil a long piece of wire around an iron nail at least twenty times. Then connect both ends of the wire to a battery.

Stroking

The magnetised magnet is able to attract magnetic materials. However it can only keep its magnetism for a short period of time.

An iron nail can also be made into a magnet by stroking it several times with a strong magnet along its entire length in the same direction.

Induction

The nail is said to be magnetised by induction.The magnetised nail is now able to pick up some metal clips.As soon as the strong magnet is removed, the nail loses its magnetism.

When an iron nail is in contact with a strong magnet, it becomes a magnet.

Freely suspended

A freely suspended magnet always comes to rest in a north-south position.

Non-magnetic materials

-Wood -Glass...

Magnetic materials

-Iron -Steel -Nickel -Cobalt -Magnets

Types of magnets

Button magnet

Ring magnet

Rod magnet

Horseshoe magnet

U-shaped magnet

Bar magnet

Characteristics of a magnet

Objects that are not attracted to magnets are made of non-magnetic materials.

Objects that are attracted to magnets are made of magnetic materials.

Are used in

Everyday objects such as

-Doorstoppers -Compasses -Refrigerators -Magnetic game boards

Poles

Like poles

Repel

The south pole of a magnet will repel the south pole of another magnet.

Unlike poles

Attract

The north pole of a magnet will attract the south pole of another magnet.

Has two poles

The south pole and the north pole.

The pull of a magnet is the strongest at the two poles.

The pull of the magnet can pass through some materials.

Such as

(non-magnetic materials) Wood, glass, copper, aluminium...

Can be made from

Lodestones

A lodestone or a natural magnet is a piece of magnetic ore.

Artificial

Artificial magnets are made of iron, steel, nickel or cobalt.