Chapter 8 P2
Chapter 8 P2
Chapter 8 P2
circl to show
ELECTROMAGNETISM the direction of the compass.
(ii) The coils PQ act as a magnet.
8.1 ELECTROMAGNETISM State the magnetic polarity at :
1. P: Q:
The diagram shows 4 compasses are
placed on a horizontal cardboard. A (iii)On
On the diagram below, sketch
straight wire passes through the magnetic field line around and
centre of the cardboard. When the inside the coils PQ. Show the
current is switched off, all the direction of the magnetic
magneti field.
compasses needles point north.
2.
The structure of a relay and its
related connections is shown is
diagram below.
(b) Current passes through a coil (ii) The relay coil is wound on a
PQ as shown below. The metal core M. State a suitable
circles represent the material for this metal core M.
compasses.
(iii)Explain
Explain why this material is
suitable to be used.
FIZIKMOZAC 2010
3. Question 8: SBP 08
Diagram 8.1 shows a simple
electromagnet used for lifting and Material used Shape of the
releasing a small metal ball. for the core core
Steel
Soft iron
Aluminium
Diagram 8.1
…………………………………… ...........................................
[ 1 mark ] [ 1 mark ]
…………………………………….
……………………………. (c) Explain how the motion of the
[ 3 marks] copper rod is produced.
_________________________
_________________________
FIZIKMOZAC 2010
(ii) the battery is replaced by (iii)name
name the rule used to
a.c. power supply determine the direction of
the force.
_______________________
________________________
_______________________
(e) What is the direction of
(e) Name one instruments which rotation of the coil?
use
se the principle involved in
(b). _________________________
____________________________
__________________________
6. The diagram shows the
arrangement of an apparatus to
5. The diagram shows the structure investigate the interaction
of a direct current motor. between a current-carrying
carrying
conductor and the e magnetic field.
(i) P : _____________________
(ii) Q : ____________________
(a) Name the type of the magnet
(b) What is the function of the part is used.
labeled
(i) P : _____________________
(b) When the switch is closed,
(ii) Q : _____________________ (i) indicate and label the
direction of the current
(c) Label the direction of the flows through wire X.
current in the coil.
(d) State and label the direction of (ii) what happen to motion of
the forces acting on wire X and give the reason
(i) the
e SV side of the coil: ____ for your answer.
(ii) the
e TU side of the coil: ____
FIZIKMOZAC 2010
(c) Suggest two ways to change (iii) How can n the magnitude of the
the direction of the motion of force be increased?
wire X.
……………………………………….
_______________________
……………………………………….
[2 marks]
_______________________
8. Figure(a) shows the structural
7. Question 5:Pahang 08 design of a moving coil ammeter.
Diagram 5 demonstrates the force
acting on a current carrying
conductor in a magnetic field.
Diagram 5
..................................................... Figure(b)
[1 mark]
(ii) Draw the pattern of (b) When the current flows through
electromagnetic field that the coil, the pointer is
produces the motion of the deflected.
copper wire as in (a)? (i) What type of current is used?
FIZIKMOZAC 2010
(ii)Explain how the pointer Table 8 shows the specifications of four
deflects. galvanometer J, K, L and M.
Galva- Wire Core Number
_________________________ nometer used material of turns
for the of coils
_________________________ coil
(iii) Why is the coil stops to J Thin Soft Large
deflect? iron
K Thick Steel Small
__________________________ L Thin Steel Small
M Thick Soft Large
__________________________ iron
...................................................
Reason
...................................................
[2 marks]
(ii) Core material
...................................................
Diagram 8
Reason
The galvanometer uses the
interaction between the magnetic ...................................................
field of a permanent magnet and the [2 marks]
magnetic field of an electromagnet to
measure a small current. The coil of
the galvanometer gets heated up (iii) Number of turns of the coil
quickly, thus affecting the reading
shown by the pointer. ...................................................
(a) What is meant by
electromagnet? Reason
…………………………………………… ...................................................
[1 mark] [2 marks]
FIZIKMOZAC 2010
(c) Based on the answers in 8(b),
determine the most suitable (a) (i) Name the type of motor
galvanometer in Table 8 to shown in the diagram above.
measure a small current.
……………………………………….
………………………………………… [1 mark]
[1 mark] (ii) what is the function of the
part labeled X?
(d) A resistor is added to the
galvanometer to enable it to ……………………………………….
[2 marks]
produce a full-scale
scale deflection
when the current is 1 Ampere.
(b) (i) By refering to Diagram 7.1,
(i) State how the resistor should
draw the related catapult field
be connected to the
in the diagram below.
galvanometer. Tick (x) the
[1 mark]
correct answer.
Diagram 7.1
FIZIKMOZAC 2010
(a) Mark on the wire the direction
of the induced current that
flows through it.
.................................................... ________________________
[2 marks]
(ii) the wire is moved vertically
(ii) To increase the strength of the upwards at a higher speed.
magnetic field.
_______________________
.....................................................
(iii)The
The wire is held stationary
..................................................... in between the poles of the
[2 marks] magnet.
________________________
_____________________
8.3 ELECTROMAGNETI C
INDUCTION 12. The south pole of a bar magnet is
moved towards a solenoid that it
11. A straight thick copper wire that is connected to a sensitive centre-
centre
connected to a sensitive centre
centre- zero galvanometer.
zero galvanometer is moved
vertically
tically downwards in a
magnetic field.
FIZIKMOZAC 2010
i. Mark on the solenoid: ……………………………………..
(i) the end that will become [1 mark]
a south pole.
(b) State the polarity of the solenoid
(ii) The direction of the at mark ‘X’. Tick () the correct
induced current. answer in the box below.
________________________ South
[1 mark]
________________________ (c) Diagram 2.2 shows a magnet bar
is pulling away from inside a
solenoid.
13. Question 2:Melaka 09
Diagram 2.1 shows a bar magnet
before and when is pushed into a
solenoid.
Diagram 2.1
On Diagram 2.2
(i) mark the direction of the
current flow in the circuit
14. Question 4
Diagram 4 shows a bar magnet is
hung on a spring that attached to a
Diagram 2.1 retort stand. The bar magnet is
displaced downwards and released
(a) Name the science phenomenon so it can oscillate through a solenoid
involved in Diagram 2.1? which is connected to a centre-zero
galvanometer.
FIZIKMOZAC 2010
(ii) Give the reason for your
answer.
...................................................
[1 mark]
...................................................
........................................
[1 mark]
..................................................
[1 mark]
B : ........................................... …………………………………….......
[2 marks] [1 mark]
(b) Based on Diagram 6.1 and
(c) If the spring is replaced by a Diagram 6.2:
stiffer spring, (i) State two differences that can
(i) state the change to the angle be observed from Diagram 6.1
of deflection of the and Diagram 6.2.
galvanometer pointer?
....................................................
.....................................................
[1 mark] ....................................................
FIZIKMOZAC 2010
[2 marks] [1 mark]
(ii) Based on the answer in (b)(i), (b) Based on the direction of the
explain why these differences current in Diagram 6.1 and
occur? Diagram 6.2;
(i) Label the polarity at the end of
.................................................... each solenoid in box X and box
Y.
....................................................
[2 marks]
....................................................
[2 marks] (ii) Label the direction of motion of
the bar magnet in Diagam 6.1
(c) Name the physics law and Diagram 6.2
involved in 6(b)(ii).
[2 marks]
.............................................
................................................
[1 mark] (c)(i) Based on the answers in 6(b)(i)
and 6(b)(ii), state the effect of
(d) Explain why the direction of the polarity at the end of the
current in the solenoid is upward solenoid on the motion of the
as shown in Diagram 6.1 and bar magnet.
Diagram 6.2?
......................................................
........................................................
...............................
...............................
........................................................ [2 marks]
[2 marks]
(ii) Name the law that applies to
16. Kedah 07 Q6 (c)(i).
Diagram 6.1 and Diagram 6.2 show
that a current is induced in a
....................................................
..............................
solenoid when there is relative
[1 mark]
motion between the solenoid and the
bar magnet. (d) Suggest one method to increase
the induced current in the
solenoid.
.....................................
..................................
[1 mark]
.....................................
.............................
FIZIKMOZAC 2010
_______________________
_______________________
(c) Draw a graph to show the (b) State one reason why the a.c.
variation with time of the voltage is supplied.
current in conductor YZ.
…………………………………………
[ 1 mark ]
FIZIKMOZAC 2010
alternating current. is replaced by ..........................................................
........................................
a voltage supply 240 V direct [1 mark]
current.
(c) For the bulb operating at the
(i) What happens to brightness of normal brightness, calculate:
the bulb. (i) the current in the secondary
coil.
………………………………………
[1 mark ]
(ii) Give the reason for your [2 marks]
answer.
(ii) the current in the primary coil.
……………………………………... Assume that the transformer is
[ 1 mark ] ideal.
[2 marks]
19. Question 4: Johor 2007
Diagram 4.1 shows a simple 20. Question 6: Teknik 07
transformer used to light up a bulb Table 6 gives the details of two
labelled 24 V, 36 W. transformers P and Q
..........................................................
......................... .....................................................
[2 marks] [1 mark ]
(b) Compare the voltages for each
(b) Explain
plain why the core is made transformers.
from iron.
.....................................................
FIZIKMOZAC 2010
[1 mark]
.....................................................
.....................................................
[1 mark]
(ii) Therefore,determine the type Diagram 10.1
of transformer P and Q.
Transformer P : ……………….
Transformer Q : ……………..
[2 marks]
....................................................
[1 mark] Diagram 10.2
(ii) What happens if another type When the switch is on and paper
of current applied to the clips of the same amount are put in
primary coil? Explain your the plates, the paper clips are
answer attracted to the solenoids.
(a) What is an electromagnet?
[2 marks] [1 mark]
(b) Using Diagram 10.1 and Diagram
10.2, compare the number of
ESSAY QUESTIONS turns in solenoid, the magnitude
of current flowing and the
21. Conceptual: Perak 07 number of paper clips attracted
Diagram 10.1 and 10.2 show to the solenoid.
insulated copper wires are wrapped [3 marks]
around rods to form solenoids. The (c) State the relationship between
solenoids are connected to the strength of the magnetic
ammeters, rheostats, switches and field and
dry cells. (i) the magnitude of current
(ii) the number of turns in
solenoid
[2 marks]
FIZIKMOZAC 2010
22. Conceptual: MRM 07 23. Understanding : Perak 07
Figure 10.1 shows a magnet placed Diagram 10.3 shows a simple
on a stationary trolley. Figure 10.1(a) electromagnet consists of a solenoid
is the situation when the trolley is with soft iron core inside. And, two
stationary while Figure 10.1(b) is the magnet bars are hung freely at both
situation when the trolley is moving sides of the solenoids.
into the solenoid. Figure 10.2(a)
shows a conductor which is
stationary in the magnetic field while
figure 10.2(b) shows the conductor
being moved downwards
wnwards in the
magnetic field.
Diagram 10.3
FIZIKMOZAC 2010
(ii) Based on Diagram 12.1, which 27. Qualitative problem: MRSM 07
transformer is a step-up You are given two coils R and S, with
transformer? Give one reason for 50 and 100 turns respectively, an iron
your choice. core and a 240 V a.c power supply.
[ 2 marks ] All the materials are used to build a
simple transformer.
(iii)Practically a transformer is not (i) Using all the materials supplied
100% efficient. Some energy is and with the aid of a labeled
lost in the transformer. List the diagram, explain how you are
factors that cause the energy going to build a simple step-up
loss in a transformer. transformer.
[3 marks] [4 marks]
Diagram 10.4
[ 3 marks ]
FIZIKMOZAC 2010
(iii) Table 12.2 shows the used and give reasons for
characteristics of four types of your choice.
cables that are of the same [10 marks]
length.
FIZIKMOZAC 2010
32. Section C:Trengganu 07 You are asked to study the electric
Diagram 12.1 shows an electric bell. bells P,Q,R,S and T.
Explain the suitability of each
characteristic of the electric bell in
Table 12 and hence, determine which
electric
ic bell is able to produce the
loudest sound.
Justify your choice.
[10 marks]
Diagram 12.1
FIZIKMOZAC 2010
(a) What is meant by catapult field ? (e) Diagram 10.4 shows
ows a d.c.
[1 mark] electric motor .
FIZIKMOZAC 2010
Model
coil
Density of the
turns of the coil
Number of
magnet
Strength of
the commutator
segments in
Number of
34. Section C: Kedah 08
Diagram 12.1 shows a simple direct
current electric motor.
FIZIKMOZAC 2010
35. Melaka 08 section B
Diagram 9.1 shows the pattern of
magnetic field formed when current
flows in a coil. The magnetic field
strength is greater at the center
compared to the edge
(a) (i) What is meant by magnetic (i) Based on Diagram 9.2 and
field? Diagram 9.3, compare the
[1 mark] - pattern of the magnetic field
- direction of the magnetic field
fie
(ii) Explain why the strength of (ii) Based on Diagram 9.2 ,Diagram
the magnetic field is greater 9.3 and 9.4 compare the pattern
at the center of the magnetic field
[3 marks] (iii) Based on Diagram 9.4 compare
the direction of the resultance
(b) Diagram 9.2 and Diagram 9.3 forces
show the the magnetic field (iv) Name one instrument which
produce when current uses the same principle as in
flows in a conductor. Diagram 9.4. Explain the
Diagram 9.4 shows the magnetic similarities.
field produced when current [5 mark]
carrying conductors in (c) Diagram 9.5 shows a moving
m
Diagram 9.2 and Diagram 9.3 is coil loudspeaker.
placed in magnetic field
FIZIKMOZAC 2010
36. Section B:SBP 08
(a) Diagram 10.1 and Diagram 10.2
show the relative motion
between the magnet and
solenoid. Ends of the coils are
connected to a centre-reading
centre
galvanometer.
Diagram 10.1
FIZIKMOZAC 2010
(c) Diagram 10.3 shows a direct Using an appropriate concept in
current generator physics, suggest and explain suitable
modifications or ways to enable the
microphone to detect sound
sou
effectively and generate bigger
current based on the following
aspect:
[10
10 marks]
marks
Diagram
ram 10.3 37. Section B:Melaka
Melaka 09
Diagram 10.1 and Diagram 10.2 show
Explain how the above generator the initial and the final position of a
works to produce direct current. copper rod due to the formation of a
catapult field that produce a force.
[4 marks]
Diagram 10.4
FIZIKMOZAC 2010
Explain what happens to
(a) What is meant by catapult field? copper strip WX and YZ when
[ 1 mark] the switch is closed.
[ 4 marks] [1
(b) Using Diagram 10.1 and
Diagram 10.2, compare the (e) Diagram
iagram 10.4 shows a moving coil
angle of deflection of the ammeter
ammeter pointer , the power
supply and the distance moved
by the copper rods.
[3 marks]
[ 10 marks]
FIZIKMOZAC 2010
38. Section B:Kelantan 09 strength of the magnetic
Diagram 10.1 and Diagram 10.2 show field
the deflection of a galvanometer [1 mark]
when a bar magnet are pushed into (ii) The strength of the
two identical solenoids. magnetic filed and the
deflection of the
galvanometer
[1 mark]
FIZIKMOZAC 2010
Suggest modifications that can be during reception of electricity by
made to increase the output current customers.
to the generator in Diagram 10.4.
State and modifications based on the
following aspects: Physical Transmission of
(i) Strength of the magnet quantity electricity
(ii) Shape of the magnet Before After
(iii) Number of turns of the coil substation substation
(iv) Diameter of the wire of the B B
coil Current 15 A 60 A
(v) The speed of rotation
[10 marks] Potential 132 kW 33 kW
Difference
Table 10.2
FIZIKMOZAC 2010
(ii) Using Diagram 10.1 and Diagram
10.2 compare the current flow,
the amount of iron filing and
the magnetic field strength of
the two electrodes. Relate the
current flow and amount of iron
filing attracted by the
electromagnet
lectromagnet and the magnetic
field strength.
[ 5 marks ]
Based on Diagram 10.1 and
your knowledge about
transmission of electrical
(b) Diagram 10.3 shows a circuit
power and other related
breaker.
physics concepts, explain
(i) The characteristics of
materials used to build
the pylons.
(ii) The design of the
pylons.
(iii) The characteristics of
the cable used in the
electrical power
transmmission
[10 marks]
Diagram 10.3
FIZIKMOZAC 2010
(c) Diagram 10.4 shows an a.c
generator
Diagram10.4
[6 marks]
FIZIKMOZAC 2010