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This question is about the magnetic fields around bar magnets. Fig. 7.1 shows two positions used
by a student doing an experiment.
position 1
position 2
Fig. 7.1
(a) Fig. 7.2 shows a magnet, labelled magnet 1, placed on position 1.
magnet 1
S
position 2
N
Fig. 7.2
On Fig. 7.2, draw lines to show the pattern of the magnetic field produced by magnet 1.
Place arrows on the lines to show the direction of the field.
[3]
(b) Magnet 1 is removed from position 1. Fig. 7.3 shows another magnet, labelled magnet 2,
placed on position 2.
position 1
magnet 2
N
S
Fig. 7.3
On Fig. 7.3, draw, at the right-hand end of position 1, a line with an arrow to show the direction
of the magnetic field produced by magnet 2.
[1]
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(c) Fig. 7.4 shows magnet 1 placed on position 1 and magnet 2 placed on position 2.
magnet 1
S
magnet 2
N
N
S
Fig. 7.4
(i)
State the direction of the force that the N pole of magnet 2 exerts on the N pole of
magnet 1.
..................................................................................................................................... [1]
(ii)
Justify your answer to (c)(i).
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..................................................................................................................................... [1]
[Total: 6]
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9
(a) Fig. 9.1 shows a bar magnet and four plotting compasses A, B, C and D.
D
C
A
bar magnet
B
Fig. 9.1
On Fig. 9.1:
(i)
draw an arrow on each of the three plotting compasses B, C and D to show the direction
of the magnetic field
[2]
(ii)
label the magnetic poles of the bar magnet N and S.
[1]
(b) Describe one method for demagnetising a bar magnet.
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(c) Fig. 9.2 represents a current in a wire. The current is into the plane of the paper.
(i)
Draw the pattern of the magnetic field produced around the wire. Show clearly the
direction of the magnetic field.
Fig. 9.2
[2]
(ii)
The direction of the current in the wire is reversed. The magnitude of the current is
unchanged.
State the effect that reversing the current has on the magnetic field produced.
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Fig. 7.1 shows a small plotting compass which is aligned with the magnetic field between magnetic
poles A and B of a U-shaped magnet.
A
S
N
B
Fig. 7.1
(a) State the polarity of the poles.
pole A ........................................................................................................................................
pole B .......................................................................................................................................
[1]
(b) Fig. 7.2 shows a wire, placed between two poles, carrying a current in the direction of the
arrow.
S
N
Fig. 7.2
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On Fig. 7.2, draw an arrow to show the direction of the force on the wire due to the magnetic
field.
[2]
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(c) Fig. 7.3 shows a β-particle moving in the direction of the arrow between the same two poles.
S
β-particle
N
direction of travel of β-particle
when in the position shown
Fig. 7.3
On Fig. 7.3, draw an arrow to show the direction of the force on the β-particle due to the
magnetic field.
[2]
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8
(a) Fig. 8.1 shows the single turn coil of a simple direct current (d.c.) motor.
S
N
current
coil
O
Fig. 8.1
(i)
Explain the direction of the turning effect as seen by an observer at O.
...........................................................................................................................................
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..................................................................................................................................... [2]
(ii)
The coil is replaced by an otherwise identical new coil with three turns and the same
current in the coil.
State how the turning effect compares with the turning effect in (i).
..................................................................................................................................... [1]
(iii)
A third coil is identical to the coil in (i) except that its resistance is three times greater.
The potential difference (p.d.) across the coil is the same as the p.d. in (i).
State how the turning effect compares with the turning effect in (i).
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(b) Fig. 8.2 is a voltage–time graph showing the output of a simple alternating current (a.c.)
generator at times t0, t1, t2 and t3.
voltage
time
t0 t1
t2
t3
Fig. 8.2
Fig. 8.3 is an end view of the plane of the coil of the generator at time t0. The coil is rotating
clockwise.
A
axis of rotation
B
Fig. 8.3
(i)
Draw an end view of the position of the plane of the coil at time t1. Include the labels
A and B.
[1]
(ii)
Draw an end view of the position of the plane of the coil at time t2. Include the labels
A and B.
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(iii)
Draw an end view of the position of the plane of the coil at time t3. Include the labels
A and B.
[1]
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