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Name: No. IC:.
PENGGAL 2 960/2 STPM 2015
JABATAN PENDIDIKAN NEGERI KELANTAN
SIJIL TINGGI PERSEKOLAHAN MALAYSIA
PHYSICS 2 (FIZIK 2)
MODUL 1 One and a half hours ( Satu jam setengah)
Instructions to candidates:
DO NOT OPEN THIS QUESTIONS PAPER UNTIL YOU
ARE TOLD TO DO SO.
There are fifteen questions in Section A. For each questions,
four
choices of answers are given. Choose one correct answer and
indicate it on the Multiple-choice Answer Sheet provided. Read
the
instructions on the Multiple-choice Answer Sheet very
carefully.
Answer all questions. Marks will not be deducted for wrong
answers.
Answer all questions in Section B. Write your answers in the
spaces provided.
Answer any two questions in Section C. All essential working
should be shown. For numerical answers, unit should be
quoted
wherever appropriate. Begin each answer on a fresh sheet of
paper
and arrange your answers in numerical order.
Tear off the front page of this question paper in your
answer
sheets of Section B, and tie both of them together with your
answer
sheets in Section C.
Values of constant are provided.
Answers may be written in either English or Bahasa Malaysia
For examiners use (Untuk kegunaan
pemeriksa)
Section A
(Bahagian A)
Section B
(Bahagian B)
16
17
Section C
(Bahagian C)
Total
(Jumlah)
This question paper consists of 12 printed pages and 0 blank
pages.
(Kertas soalan ini terdiri daripada 12 halaman bercetak dan 0
halaman kosong.)
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Answer all questions in this section
1. Which of the following physical quantities does not have a
value of zero on the surface
of an isolated conductor?
A Electric potential at the surface
B Current flowing on the surface.
C Magnetic field near the surface.
D Electric field along the surface.
2 Three charges are located along the x axis as shown in the
drawing. The mass of the
1.2 C is 4.0 109 kg. Determine the magnitude and direction of
the acceleration of the
1.2 C charge when it is allowed to move if the other two charges
remain fixed.
A 2 105 ms-2, to the right
B 1 105 ms-2, to the left
C 7 104 ms-2, to the right
D 3 105 ms-2, to the left
3 A capacitor of capacitance 15F is fully charged and the
potential difference across its
plate is 8.0V. It is then connected into the circuit as
shown
The switch S is closed at time t = 0. Which one of the following
statements is correct?
Section A [15 marks]
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A the time constant of the circuit is 6.0ms.
B The initial charge on the capacitor is 12C.
C After a time equal to twice the time constant, the charge
remaining on the capacitor is
Qoe2, where Qo ts the charge at timen t=0.
D After a time equal to the time constant, the potential
difference across the capacitor is
2.9V.
4. The circuit diagram shows two capacitors of capacitances 300
F and 500 F connected
in series with a 6.0 V battery.
The charge in the 300 F capacitor is
A 0.68 mC C 1.8 mC
B 1.1 mC D 4.8 mC
5 Which of the following circuits show a bridge circuit which is
not in equilibrium?
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6 In the circuit below, the ammeter reading is I and the
voltmeter reading is V.
When of the switch is closed, which row describes what happens
to I and V ?
I V
A decreases decreases to zero
B increases decreases to zero
C increases stays the same
D stays the same increases
7 The principles of conservation of which two quantities are
associated with Kirchhoffs first
and second laws?
First Law Second Law
A charge energy
B charge voltage
C energy charge
D voltage charge
8 A conducting loop of wire is placed in a magnetic field that
is normal to the plane of the
loop. Which one of the following actions will not result in an
induced current in the loop?
A Rotate the loop about an axis that is parallel to the field
and passes through the center of
the loop.
B Increase the strength of the magnetic field.
C Decrease the area of the loop.
D Decrease the strength of the magnetic field.
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9 The current in a solenoid is decreased to one-half of its
original value. Which one of the
following statements is true concerning the self-inductance of
the solenoid?
A The self-inductance does not change.
B The self-inductance increases by a factor of two.
C The self-inductance decreases by a factor of two.
D The self-inductance increases by a factor of four.
10 Four long straight parallel wires carry equal currents
directed vertically out of the page.
They are arranged on the corners of a square as shown in the
figure below
The direction of the resultant magnetic force exerted on the
wire labelled X is
A. south.
B. north.
C. west.
D. east.
11 In the above figure, a wire and a 10 ohm resistor are used to
form a circuit in the shape
of a square, 20 cm by 20 cm. A uniform but non-steady magnetic
field is directed into the
plane of the circuit. The magnitude of the magnetic field is
decreased from 0.60 T to 0.20 T
in a time interval of 45 ms. The average induced current and its
direction through the
resistor, in this time interval, are closest to:
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A 36 mA, from b to a
B 21 mA, from b to a
C 36 mA, from a to b
D 21 mA, from a to b
12 An a.c. supply is connected to a resistor. When the peak
value of the e.m.f. of the
supply is Vo and the frequency is f, the main power dissipated
in the resistor in P. The
supply frequency is then changed to 2f, the peak value of the
e.m.f. remaining as Vo.
What is now the mean power in the resistor?
A P
B
C 2P
D 4P
13 Two concentric rings X and Y are placed on the horizontal
plane, as shown in the
diagram below.
The radius of ring X is r1= 1.0 m and r2 = 2.0 m. The current
flows in ring Y is four times the
current in ring X but in the opposite direction. The resultant
magnetic flux density at the
centre of the rings is
A Io5.1 and points towards N B Io5.0 and points towards N
C Io5.0 and points towards S D Io5.1 and points towards S
X
Y
N
r1 r2
I
4I
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14 The table below shows the values of the resistance,
capacitive reactance and inductive
reactance for five RCL circuits. In which circuit will the
voltage lead the current?
Resistance Capacitive reactance Inductive reactance
A 30 219 180
B 50 288 244
C 120 58 18
D 150 79 212
15 A variable capacitor is connected to an ac source. What
effect does decreasing the
capacitance have on the reactance and current in this
circuit?
Reactance Current
A decreases no change
B increases increases
C decreases increases
D increases decreases
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SECTION B [15 Marks]
Answer all questions in this section
16. Two metal spheres X and Y which are far apart are joined by
a wire. The radius of
sphere X is 1r and that of sphere Y is 2r . The charge densities
on the surface of the sphere
X and Y are 1 and 2 respectively.
(a) Find, in terms of 1 and 2
(i) the ratio of the electric field intensity on the surface of
sphere to that on the
surface of sphere Y.
[3 Marks]
(ii) the ratio of the electric potential the surface of X to
that of Y.
[1 Mark]
(b) Hence find the ratio of 2
1
, in terms of 1r and 2r .
[2 Mark]
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17 (a) Define self-inductance
. [2 marks]
(b) A constant e.m.f. of 1.04 V is induced by a changing current
in a coil of inductance
0.26H. The initial current is 13.0 A. Calculate, after 2.0 s of
supplying the current,
(i) the current in the coil,
[3 marks]
(ii) the magnetic flux linkage in the coil.
[2 marks]
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Section C [30 Marks]
Answer two questions only in this section
18. An alternating voltage is represented by V = 2.0 sin
314t
(a) What is
(i) the frequency [1 mark]
(ii) the r.m.s. voltage for this a.c.? [2 marks]
(b) The a.c. referred to in (a) is connected to a pure inductor
of 5 mH.
(i) Explain why this inductor produces an e.m.f. which opposes
the supply voltage.
[2 Marks]
(ii) At a particular instant the supply voltage is 1.0 V What is
the back e.m.f. in the
inductor at that instant?
[1 Mark]
(iii) What is the r.m.s. current that flows in this
inductor?
[2 Marks]
(c) (i) Sketch a graph to show the variation of voltage across
the inductor with time. On
the same axes, sketch the graph of the variation of current in
the inductor with time.
[3 Marks]
(ii) Based on the graph in (c)(i), explain why the average power
supplied to the
inductor is zero.
[3 Marks]
19 (a) An electric iron is labelled 240 V; 1.2 kW What do you
understand by the labelling?
[2 marks]
(b) (i) Define drift velocity. [2 marks]
(ii) Copper has a molar mass of 3105.63 kg and a density of 8900
kg 3m .
Assuming that each copper atom contribute one free electron,
calculate the drift
velocity of the electrons in a copper wire of radius 1.0 mm
carrying a current of
0.15A.
[6 marks]
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(c) A copper conducting rod carries a current of 15.0 A. The
cross-sectional area of the
copper rod is a square of side 4.0 mm and its length is 60 m.
Copper has a resistivity of
1.69x 10-8 m. Calculate
(i) the density of the current in the copper rod, [3 marks]
(ii) the resistance of the copper rod. [2 marks]
20. (a) Explain the meaning of the Hall effect. Describe a
simple experiment to demonstrate
the Hall effect.
[5 Marks]
(b) The figure shows a conductor where the majority of the
charge carriers are free electrons
of charge e and volume density n. The dimensions of the
conductor are as shown. The
conductor carries a current I and is in a magnetic field of flux
density B.
(i) Derive an expression for the Hall voltage produced in a
conductor in terms of the
quantities mentioned above.
[4 Marks]
(ii) State the polarities of the Hall voltage.
[2 Marks]
(iii) What information may be deduced from the magnitude and
direction of the Hall voltage
produced in a conductor?
[4 Marks]
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Values of constants
(Nilai Pemalar)
Acceleration of free fall
Avogadro constant
Boltzmann constant
Gravitational constant
Magnitude of electronic
charge
Mass of the Earth
Mass of the Sun
Molar gas constant
Permeability of free space
Permittivity of free space
Plancks constant
Radius of the Earth
Radius of the Sun Rest mass
of electron
Rest mass of proton
Speed of light in free space
Stefan-Boltzmann constant
Unified atomic mass unit
(Pecutan jatuh bebas)
(Pemalar Avogadro)
(Pemalar Boltzmann)
(Pemalar graviti)
(Magnitud cas elektron)
(Jisim Bumi)
(Jisim Matahari)
(Pemalar gas molar)
(Ketelapan ruang bebas)
(Ketelusan ruang bebas)
(Pemalar Planck)
(Jejari Bumi)
(Jejari Matahari)
(Jisim rehat elektron)
(Jisim rehat proton)
(Laju cahaya dalam ruang bebas)
(Pemalar Stefan-Boltzmann)
(Unit jisim atom bersatu)
g = 9.81 m s-2
NA = 6.02 x 1023
mol-1
k, kB = 1.38 x 10-23
J K-1
G = 6.67 x 10-11
N m2 kg
-2
e = 1.60 x 10-19
C
ME = 5.97 x 1024
kg
MS = 1.99 x 1030
kg
R = 8.31 J K-1
mol-1
0 = 4 x 10-7
H m-1
0 = 8.85 x 10-12
F m-1
= (
)
h = 6.63 x 10-34
J s
RE = 6.38 x 106 m
RS = 6.96 x 108 m
me = 9.11 x 10-31
kg
mp = 1.67 x 10-27
kg
c = 3.00 x 108 m s
-1
= 5.67 x 10-8 W m-2 K-4
u = 1.66 x 10-27
kg