Induced and permanent magnets

A device that uses a free-moving magnetic needle to show direction is a:

• Ruler

• magnet

• compass

• magnetic field

How is a permanent magnet DIFFERENT from a temporary magnet?

• A permanent magnet attracts materials made of iron.
• A permanent magnet has poles.
• A permanent magnet has a magnetic field.
• A permanent magnet keeps its magnetism for a long time.

Where is the force of attraction the strongest on a magnet?

• at the poles
• in the middle
• above the magnet
• below the magnet

Why does a compass needle point north?

• The compass is a bar magnet
• Because north is up
• Because it's magic
• It lines up with the Earth's magnetic field

If you cut a magnet in half, what happens to the poles?

• One half gets the North Pole, the other half gets the South Pole
• Both halves get only a North Pole
• Both halves get only a South Pole
• Both halves get a North pole and a South Pole

What is responsible for the Magnetic Field around Earth?

• The Earth's crust
• The Earth's molton iron core
• The Earth's mantel
• The Sun

A refrigerator magnet is an example of a:

• magnetic material
• permanent magnet
• horseshoe magnet
• temporary magnet

Which these materials are magnetic?

• Cobalt, iron, steel, nickel

• Aluminium, iron, steel, nickel

• Iron, lithium, steel, nickel

• Cobalt, magnesium, steel, nickel

What is the difference between a permanent magnet and an induced? (you can chose more than one option)

• Permanent magnets do not produced their own magnetic field.

• Permanent magnets produced their own magnetic field.

• Induced magnets are always magnetic.

• Induced magnets only turn into magnets with they are put into a magnetic field.

What happens to the magnetic field of an induced magnet when it is moved far away from a permanent magnet?

• It gets greater.

• It stops being produced.