Magnetism and electric currents - Test Bite

1. Which of the following are magnetic poles?

north and south
east and west
red and blue

2. Which of the following is not a magnetic material?

steel
cobalt
aluminium

3. What do two poles of the same type do when they are brought close together?

they attract
they repel
they make an electric current flow

4. What do two unlike poles do when they are brought close together?

they attract
they repel
they make an electric current flow

5. The arrow on magnetic field lines shows them flowing in which direction?

from south to north
from north to south
from left to right

6. Where are the field lines most concentrated around a bar magnet?

at both poles
in the middle
at the north pole only

7. How can we increase the strength of an electromagnet?

add an iron core
reduce the number of turns on the coil
reduce the current in the coil

8. What is one difference between electromagnets and bar magnets?

Bar magnets can be turned off but electromagnets cannot.
Bar magnets have a magnetic field but electromagnets do not.
Electromagnets need electricity but bar magnets do not.

9. What can we use to find the shape of a magnetic field?

an electromagnet
a coil of wire
a compass

10. What two gases are produced from electrolysis of water?

magnesium and hydrogen
hydrogen and oxygen
oxygen and magnesium

11. What is NOT true about energy saving light bulbs?

they use less energy than normal bulbs
they transfer less of their energy into heat
they are brighter than normal bulbs