SMK RAJA PEREMPUAN, IPOH
LATIHAN SEMASA CUTI 2008
PHYSICS FORM 5
ELECTROMAGNETISM PAPER 1
1
The diagram shows an arrangement of apparatus to study the pattern of
magnetic fields which are formed when current flows through conductors.
SPM 2004
Which magnetic pattern is formed on the cardboard when both switches are closed ?
1
2. The diagram shows an electromagnet.
SPM 2005
Which factor does not influence the strength of the electromagnet ?
A Material used for the wire
B Material used for insulator of the wire
C Number of turns of wire
D Current flowing in the wire..
2
3. When the switch is closed in the circuit below , wire R deflects.
SPM 2004
The direction of the deflection can be determined by
A
B
C
Fleming ‘ s right hand rule
Fleming’s left hand rule
Maxwell ‘s corkscrew rule
4. The diagram shows a coil of wire placed next to a magnet. The galvanometer
pointer deflects when the magnet is pushed into the coil.
SPM 2004
Which action will increase the deflection of the galvanometer pointer ?
A
B
C
D
The magnetic pole is reversed
The number of coils is increased
The coil is made from insulated wire
The magnet is pushed slowly into the coil.
3
5. The diagram shows a magnet oscillating in a solenoid.
Which of these will not increase the deflection of the galvanometer pointer ?
A
B
C
D
Reversing the polarity of the magnet
Increasing the number of coils in the solenoid
Decreasing the diameter of the solenoid
Increasing the oscillation speed of the magnet.
6
Which diagram shows the correct direction of the induced current when the
magnet is moved in the direction shown ?
SPM 2005
4
7
The diagram shows the structure of an ideal transformer
SPM 2005
5
What is the potential difference across the bulb ?
A 7V
B 24 V
C 30 V
D 60 V
E 160 V
8 The diagram shows a circuit containing an ideal transformer.
Which statement is correct about the brightness of bulb P and bulb Q ?
A Bulb P is brighter than bulb Q
B Bulb P and bulb Q have the same brightness
C Bulb Q is brighter than bulb P
9. The diagram shows the structural design of an electric motor.
6
7
10. The diagram shows an electric generator connected to a cathode ray
oscilloscope.
Which trace represents the e.m.f induced in the generator when the coil is rotated at
a constant speed.?
8
SPM 2007
11. Diagram 23 shows a solenoid.
Which of the following rules may be used to determine the direction of the
current in the coil ?
A
B
C
D
Fleming ‘ s Left Hand Rule
Fleming ‘ s Right Hand Rule
Right Hand Screw Rule
Right Hand Grip Rule.
12. Diagram 24 shows a conductor wire placed in a magnetic field.
When the switch is on , the wire initially moves towards
A
B
C
D
W
X
Y
Z
9
13 Diagram 25 shows a transformer connected to a cathode ray oscilloscope (
CRO)
Which of the following wave traces is correct when the extra coil is on the core
and connected in series with the secondary coil ?
14 The purpose of using laminated iron core in a transformer is to
A
B
C
D
reduce resistance
reduce eddy current
prevent flux leakage
magnetized and demagnetized iron core easily.
10
15 Diagram 26 shows a model of the transmission of electrical energy and includes
three identical bulbs , P ,Q and R.
Which comparison of the brightness of the bubs is correct ?
A
B
C
D
P
Brightest
Bright
Brighter
Brightest
Q
Brighter
Brighter
Brightest
Bright
R
Bright
Brightest
Bright
Brighter
11
PAPER 2 (SECTION A)
SPM 2007
Diagram 7 shows a simple transformer
(a) (i) Name the type of the transformer .
…………………………………………………………………………………..
[1 mark]
(ii) State why soft iron is used as the transformer core.
…………………………………………………………………………………….
[1 mark]
(b) The number of turns on the primary coil in Diagram 7 is 1 000.
Calculate the number of turns on the secondary coil.
[2 marks]
(c) The transformer in Diagram 7 is used to switch on an electrical appliance. The
current in the primary coil is 0.1 A and the efficiency is 75 %.
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(i)
Calculate the output power of the transformer.
[2 marks]
(ii) An electrical appliance which needs 20 W of power is connected to the
transformer output.
Suggest a modification to the transformer that enables the appliance to
function correctly.
…………………………………………………………………………………………
[1 mark]
(d) A student connects a television which uses direct current to the output of the
transformer in Diagram 7.
When the television is switched on , it does not function.
(i ) Why the television does not function ?
……………………………………………………………………………………………
[1 mark]
(ii)
An electrical component is connected to the output of the transformer so
that the television functions.
Name the electrical component and state how the connection is made.
……………………………………………………………………………………
……………………………………………………………………………………
[2 marks]
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