WeyPhys KS3/4 Magnetism

Pick 3 magnetic metals from this list

• Magnesium

• Aluminium

• Iron

• Nickel

• Cobalt

Which of the following "rules" is true for magnets?

• North attracts North

• South attracts South

• North attracts South

• North repels South

What happens if you cut a bar magnet in half?

• You get a separate North pole and South pole

• You get two new smaller bar magnets.

• You get two North poles

• You get two South poles

What happens if you hang a magnet on a string and let the oscillations die down?

• It points to a random direction.

• The North pole points South.

• The North pole points north.

• The magnet ends up facing East-West

Give 2 ways to destroy the magnetism in a permanent magnet.

• Place it on tin foil in the fridge for a day.

• Heat it in a Bunsen burner.

• Drop it onto the floor seventeen times.

• Place it very high up so it feels a weaker gravitational force from Earth.

The paper clips stick to to the magnet because they become...

• permanent magnets

• demagnetised

• induced magnets

• electrostatically charged

How can you make the magnetic domains in a magnetic metal line up to make it a magnet?

• Heat it strongly so it melts then let it cool facing North-South.

• Stroke it repeatedly with another permanent magnet.

• Wrap a coil of wire around the metal and pass an electric current through the wire.

• All of these

Give 2 ways to increase the strength of an electromagnet

• Increase the size of the electric current

• Decrease the number of turns of the wire

• Increase the number of turns of the wire

• Swap the iron core for a copper core

Which way do the arrows point on a magnetic field diagram?

• Away from the magnet's South pole and towards its North pole.

• Away from the magnet's North pole and towards its South pole.

• Towards the centre of the Earth

• Towards the Earth's North pole

Why does Earth have a magnetic field?

• Because of its radioactive core.

• Due to the movement of electrons in its Nickel and Iron core

• Because of the copper wiring people have used

• Due to the Earth's gravitational pull on all metals