Question 1
Which metal can be attracted by a magnet?
A
zinc
B
lead
C
iron
D
copper
Question 2
In which way are a bar magnet and an electromagnet similar?
A
A bar magnet and an electromagnet are always magnetised when stored.
B
A bar magnet and an electromagnet can both be used to separate magnetic and non-magnetic materials.
C
A bar magnet can be made of steel and an electromagnet uses a steel core.
D
The magnetic field strength of a bar magnet and of an electromagnet can both be varied.
Question 3
Two circuits are set up as shown. The iron rods are placed close together and are able to move.
What happens to the size of the gap at X when switch S is closed?
A
It decreases.
B
It decreases then increases.
C
It increases.
D
It does not change.
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