1. One possible position for a compass near a bar magnet is pointing North. 2. The rod is made of iron and the pole at end P of the rod in position 1 is North. 3. Iron is a suitable material for the core of an electromagnet.

1. 1 Four plotting compasses are placed near a bar magnet. You may ignore any effects of the Earth’s
magnetic field.
One compass appears like this .
What is a possible position for this compass?
N B
A
C
S
D
2 One end of a rod picks up the N-pole of a bar magnet when in position 1.
The same end of the rod picks up the S-pole of the bar magnet when in position 2.
P
position 1 position 2
N
S N
S
rod rod
magnet magnet
bench
Which material is the rod made from and what is the pole at end P of the rod when in position 1?

2. 5 What is a suitable metal for the core of an electromagnet?
A aluminium
B copper
C iron
D steel
6 Which material can be picked up by a magnet?
A aluminium
B copper
C iron
D plastic
7 A piece of electrical equipment is sensitive to magnetic fields and is screened from them. To do
this, it is enclosed in a box.
Which material should be used to make the box?
A copper
B iron
C plastic
D steel
8 What always produces a permanent bar magnet?
A an iron bar in a coil carrying alternating current (a.c.)
B an iron bar in a coil carrying direct current (d.c.)
C a steel bar in a coil carrying alternating current (a.c.)
D a steel bar in a coil carrying direct current (d.c.)

3. 9 A metal bar PQ hangs from a thin thread and always comes to rest with end P pointing north.
Another bar XY of the same metal settles in no definite direction.
What happens if the two bars are brought near one another?
A End P and end Q both attract end X.
B End P attracts end X but repels end Y.
C End P neither attracts nor repels end X.
D End P repels end X but attracts end Y.
10 The diagram shows a 12Vd.c. power supply connected across a coil with a metal core.
12V d.c.
power supply
metal core
coil of wire
The core becomes a magnet when the current is switched on. It remains a magnet after the
current is switched off.
From which metal is the core made?
A aluminium
B copper
C soft iron
D steel

4. In which diagram will the nail become an induced magnet?
magnet iron bar
BA
C D
switch open switch open
11 The diagrams show an iron nail in four different situations.

5. The number of paper clips each holds is recorded when there is a current in the electromagnet
and when the current is switched off.
core
paper clips
Which substance is the best for making the core of a transformer?
A
B
C
D
number of paper clips held
when current is switched off
4
0
1
0
number of paper clips held
when there is a current in
the electromagnet
8
6
5
4
Four different substances are tested by using each as the core of an electromagnet.

6. N S
X Y Z
Which diagram shows the poles in X, Y and Z?
X Y Z
A
B
C
D
N
N
N N
NN
S
S
SS
SS
N S
N S
N S
13 A bar magnet is broken into three parts X, Y and Z.