Magnets

These magnets will...

• Attract

• Repel

• Do nothing

These magnets will...

• Attract

• Repel

• Do nothing

These magnets will...

• Attract

• Repel

• Do nothing

These magnets will...

• Attract

• Repel

• Do nothing

Which of these materials is magnetic?

• Iron

• Cobalt

• Brass

• Steel

• Nickel

Which will turn a piece of steel into a permanent magnet?

• Line it up with the Earth's magnetic field and tape along its length with a hammer

• Stroke it with a magnet , same pole and same direction each time

• Put it inside a magnetic field

• Wash it

• Heat it

Which of these will demagnetise a permanent magnet

• Hit it

• Heat it

• Use it too much

• Stroke it randomly with another magnet in different directions with different poles

• Wash it

Here are the domains in a bar of steel. Which is true?

• The steel is magnetic

• The steel is a magnet

Here are the domains in a bar of steel. Which is true?

• The steel is magnetic

• The steel is a magnet

In magnetically hard materials...

• Aligned domains stay aligned

• Domains can be aligned, but become misaligned when the material is outside a magnetic field