UAS 24-25 FAD1022 Basic Physics II
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UNIVERSITI MALAYA UNIVERSITI MALAYA
PEPERIKSAAN ASASI SAINS HAYAT / FIZIKAL EXAMINATION FOR FOUNDATION IN LIFE / PHYSICAL SCIENCES
SESI AKADEMIK 2024/2025 : SEMESTER 2 ACADEMIC SESSION 2024/2025 : SEMESTER 2
FAD1022 : Fizik Asas 2 Basic Physics 2
Mei/Jun 2025 Masa : 3 jam May/June 2025 Time : 3 hours
ARAHAN KEPADA CALON : INSTRUCTIONS TO CANDIDATES :
Kertas ini mengandungi TIGA bahagian: A, B dan C. Calon dikehendaki menjawab SEMUA soalan dari BAHAGIAN A, TIGA (3) soalan dari BAHAGIAN B dan EMPAT (4) soalan dari BAHAGIAN C.
This paper consists of THREE sections: A, B and C. Candidates are required to answer ALL questions from SECTION A, THREE (3) questions from SECTION B and FOUR (4) questions from SECTION C.
[University crest watermark]
(Kertas soalan ini mengandungi 26 soalan dalam 23 halaman yang dicetak) (This question paper consists 26 questions on 23 printed pages)
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FAD1022
PEMALAR / CONSTANTS
Jisim proton, Mass of proton, $m_{\text{p}}$ = $1.007276\ \text{u}$ Mass of proton, $m_p$
Ketelusan ruang bebas, $\varepsilon_0$ = $8.85 \times 10^{-12}\ \text{F m}^{-1}$ Permittivity of free space, $\varepsilon_0$
Kebolehtelapan ruang bebas, $\mu_0$ = $4\pi \times 10^{-7}\ \text{T m A}^{-1}$ Permeability of free space, $\mu_0$
Jisim proton, $m_{\text{p}}$ = $1.67 \times 10^{-27}\ \text{kg}$ Mass of proton, $m_p$
Jisim electron, $m_{\text{e}}$ = $9.11 \times 10^{-31}\ \text{kg}$ Mass of electron, $m_e$
Jisim neutron, $m_{\text{n}}$ = $1.008665\ \text{u}$ Mass of neutron, $m_n$
Electron charge, e = $-1.60 \times 10^{-19}\ \text{C}$ Cas electron, e
Laju cahaya, $c$ = $3.0 \times 10^{8}\ \text{m s}^{-1}$ Speed of light, $c$
Pemalar Planck, $h$ = $6.63 \times 10^{-34}\ \text{J s}$ Planck's Constant, $h$
1 atomic mass unit, 1 u = $931.5\ \text{MeV c}^{-2}$ 1 unit jisim atom, 1u
Pemalar Coulomb, $k$ = $9 \times 10^{9}\ \text{N m}^2\ \text{C}^{-2}$ Coulomb's constant, $k$
2/23
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FAD1022
FORMULA / FORMULAS
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$Q = CV$
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$U = \frac{1}{2}CV^2$
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Sambungan sesiri/ Series connection: $\frac{1}{C_{\text{eq}}} = \frac{1}{C_1} + \dots + \frac{1}{C_n}$
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Sambungan selari/ Parallel connection: $C_{\text{eq}} = C_1 + \dots + C_n$
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Tenaga/ Energy, $E = \Delta mc^2$
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Prinsip ketaktentuan Heisenberg/ Heisenberg uncertainty principle: $\Delta x . \Delta p \ge \frac{h}{4\pi}$
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Momentum/ Momentum: $p = mv$
PENUKARAN UNIT / UNIT CONVERSION
- $1 \text{ eV} = 1.602 \times 10^{-19} \text{ J}$
3/23
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FAD1022
BAHAGIAN A SECTION A
Jawab SEMUA soalan. Answer ALL questions.
A1. Terangkan bagaimana daya elektrostatik antara dua cas berubah jika (a) jarak di antara cas dikurangkan kepada separuh. (b) salah satu magnitud cas itu digandakan.
Explain how the electrostatic force between two charges changes if the (a) distance between charges is decreased to half. (b) magnitude one of the charges is doubled.
(3 markah/marks)
A2. Dua cas titik terpencil, $q_1$ dan $q_2$ dipisahkan dengan jarak AB, Rajah A2. Jika keupayaan elektrik pada P adalah sifar, kirakan nilai $q_2$.
Two isolated point charges $q_1$ and $q_2$, are separated by a distance AB, Figure A2. If the electric potential at P is zero, calculate the value of $q_2$.
(3 markah/marks)
[Diagram: Two point charges on a horizontal dashed line. Left charge labeled $q_1 = +3.6,\mu\text{C}$. Point P on the line between the charges. Distance from $q_1$ to P labeled 20 cm. Points A and B below the line; total distance from A to B labeled 50 cm. Right charge labeled $q_2$.]
Rajah A2 Figure A2
A3. Kapasitor plat selari mempunyai luas plat $0.35 \text{ m}^2$ dipisahkan oleh 10 mm dan diisi bahan dielektrik. Jika nilai pemalar dielektrik ialah 5.5, kirakan kapasitans.
A parallel-plate capacitor has plates of area $0.35 \text{ m}^2$ separated by 10 mm and is filled with dielectric material. If the dielectric constant is 5.5, calculate the capacitance.
(3 markah/marks)
4/23
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FAD1022
A8. Satu cas $6.4 \times 10^{-18}$ C bergerak dengan laju $1.5 \times 10^{6}$ m s$^{-1}$ merentasi satu pemilih halaju dan menghentam titik P dalam pemilih jisim, Rajah A8. Kirakan jisim cas jika jejari, $r$ adalah 2.8 mm dan medan magnet dalam pemilih jisim ialah 1.6 T.
A charge of $6.4 \times 10^{-18}$ C moves with a speed of $1.5 \times 10^{6}$ m s$^{-1}$ through a velocity selector and hits point P in the mass selector, Figure A8. Calculate the mass of the charge if radius, $r$ is 2.8 mm and a magnetic field in the mass selector is 1.6 T.
(3 markah/marks)
[Diagram: A negative charge $q$ enters from the left with velocity $v$ into a velocity selector with a positive plate above and negative plate below, creating electric field $E$ pointing downward. The charge then passes into a mass selector region with magnetic field $B$ directed into the page (symbol $\otimes$), following a semicircular trajectory of radius $r$ to hit point $P$.]
Rajah A8 Figure A8
A9. Satu magnet bar dibawa menghampiri satu gelung wayar, Rajah A9. Dari perspektif pemerhati, tentukan (a) kutub bagi gelung. (b) arah arus aruhan. (c) hukum fizik dalam kes ini.
A bar magnet is brought closer to a loop of wire, Figure A9. From the observer's point of view, determine the (a) pole of loop. (b) direction of induce current. (c) Physics law in this case.
[Diagram: A vertical bar magnet with N at the top and S at the bottom is being brought down toward a horizontal circular loop of wire containing a resistor $R$.]
Rajah A9 Figure A9
(3 markah/marks)
7/23
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A10. Seutas dawai panjang, 0.2 m bergerak dengan halaju seragam, 0.5 m s$^{-1}$ berserenjang dengan medan magnet, 4 T. Kirakan daya gerak elektrik aruhan dalam wayar.
A wire of length, 0.2 m moves with a uniform velocity, 0.5 m s$^{-1}$ perpendicular to magnetic field, 4 T. Calculate the induce electromotive force in the wire.
(3 markah/marks)
A11. Arus terhasil pada gelung sekunder untuk transformer ialah 0.4 A apabila arus pada gelung pertama ialah 6.0 A. Kirakan lilitan primer jika lilitan sekunder ialah 450.
The current produced in the secondary coil of a transformer is 0.4 A when the current in the primary coil is 6.0 A. Calculate the primary turns if the secondary turns is 450.
(3 markah/marks)
A12.
(a) Terangkan bagaimana peningkatan suhu mempengaruhi lengkung lutut pincang ke hadapan bagi diod silikon.
Describe how an increase in temperature affects the forward bias knee curve of a silicon diode.
(2 markah/marks)
(b) Lakarkan bentuk gelombang keluaran merentasi diod dalam litar sesiri yang mengandungi satu bekalan kuasa AU, satu perintang dan satu diod Si.
Sketch the output waveform across the diode in a series circuit containing an AC power supply, a resistor, and a Si diode.
(1 markah/mark)
A13. Satu amplifier operasi bukan menyongsang menghasilkan voltan keluaran, $V_{\mathrm{o}} = +15$ V. Jika perintang suap balik, $R_{\mathrm{f}} = 800$ k$\Omega$ dan perintang masukan, $R_{1} = 200$ k$\Omega$, kirakan voltan masukan, $V_{\mathrm{in}}$ yang diperlukan.
A non-inverting operational amplifier produces an output voltage, $V_{\mathrm{o}} = +15$ V. If the feedback resistor, $R_{\mathrm{f}} = 800$ k$\Omega$ and an input resistor, $R_{1} = 200$ k$\Omega$, calculate the required input voltage, $V_{\mathrm{in}}$.
(3 markah/marks)
8/23
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FAD1022
A14. Radioisotop Iodin-131 digunakan untuk merawat kelenjar tiroid yang terlalu aktif. Kirakan pemalar pereputan Iodin-131 jika separuh hayatnya ialah 8 hari. Berikan jawapan dalam unit SI.
The radioisotope Iodine-131 is used to treat overactive thyroid glands. Calculate the decay constant of Iodine-131 if its half-life is 8 days. Give your answer in SI unit.
(3 markah/marks)
A15. Satu elektron dipecutkan dari keadaan pegun melalui beza keupayaan $150.0~\text{V}$. Kirakan momentum elektron itu.
An electron is accelerated from rest through a potential difference of $150.0~\text{V}$. Calculate the momentum of the electron.
(3 markah/marks)
9/23
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FAD1022
BAHAGIAN B SECTION B
Jawab TIGA soalan dari Bahagian B. Answer THREE questions in Section B.
B1.
(a) Terangkan bagaimana kekuatan medan elektrik berubah apabila jarak dari cas titik digandakan.
Explain how the electric field strength changes when the distance from a point charge is doubled.
(2 markah/marks)
(b) Rajah B1(b) menunjukkan sebuah konduktor sfera berjejari $50~\text{cm}$ dan membawa cas $+25~\mu\text{C}$. Diberi $OA = 20~\text{cm}$ dan $OB = 70~\text{cm}$. Tentukan kekuatan medan elektrik pada titik (i) A (ii) B
Figure B1(b) shows a spherical conductor with a radius of $50~\text{cm}$ and carries a charge of $+25~\mu\text{C}$. Given $OA = 20~\text{cm}$ and $OB = 70~\text{cm}$. Determine the electric field strength at point (i) A (ii) B
(4 markah/marks)
[Diagram of a spherical conductor with center O. A horizontal dashed line passes through the center. Point A lies inside the sphere between O and the right surface, and point B lies outside the sphere to the right of the surface. Labels O, A, B appear below the line.]
Rajah B1(b) Figure B1(b)
10/23
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FAD1022
BAHAGIAN C SECTION C
Jawab EMPAT soalan dari Bahagian C. Answer FOUR questions in Section C.
C1.
(a) Satu cas positif bergerak dengan halaju, v ke arah paksi $-x$ menghampiri gelung yang membawa arus, Rajah C1 (a). Tentukan arah daya magnet ke atas cas pada titik P, jika gelung, titik P dan cas berada dalam satah yang sama.
Berikan jawapan anda dengan menggunakan paksi yang disediakan.
A positive charge moves with velocity, $\mathbf{v}$ in $-x$-axis direction approaching a coil carrying current, Figure C1(a). Determine the direction of the magnetic force acting on the charge at point $P$, given that the coil, point $P$ and the charge are aligned in the same plane.
Give your answer using the provided axis.
[Diagram: A circular coil on the left with a clockwise current arrow. To its right is point P, then a positive charge $+q$ with velocity vector $\mathbf{v}$ pointing left toward P. To the far right is a 3D coordinate system with $+y$ upward, $+x$ to the right, and $+z$ out of the page toward the viewer.]
Rajah C1(a) Figure C1(a)
(2 markah/marks)
17/23
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C1.
(b) Satu gelung segi empat yang membawa arus $1.5\text{ A}$ diletakkan di antara kutub-kutub magnet dengan $B = 0.8\text{ T}$, Rajah C1(b). Satah gelung berkecondongan $25^\circ$ relatif terhadap medan magnet. Tentukan
(i) tork yang bertindak ke atas gelung. (ii) arah putaran gelung sama ada ikut arah jam atau lawan arah jam.
A rectangular loop carrying a current of $1.5\text{ A}$ is placed between the poles of a magnet with $B = 0.8\text{ T}$, Figure C1(b). The plane of the loop is tilted at an angle of $25^\circ$ relative to the magnetic field. Determine the
(i) torque acting on the loop. (ii) direction of rotation of the loop whether clockwise or counterclockwise.
[Diagram: A rectangular loop labeled $abcd$ between N and S magnetic poles. Side $ab$ is labeled $0.60\text{ cm}$ and side $ad$ is labeled $0.30\text{ cm}$. The loop is tilted at $25^\circ$ to the horizontal. A curved arrow indicates rotation direction near the bottom right.]
Rajah C1(b) Figure C1(b)
(4 markah/marks)
(c) Satu wayar panjang lurus membawa arus, $I_1$ diletakkan $1.5\text{ cm}$ dari satu gelung wayar segi empat sama yang membawa arus $I_2$, Rajah C1(c). Kirakan arus $I_2$ jika daya paduan magnet yang bertindak ke atas gelung akibat wayar lurus ialah $-24.5,\mu\text{N}$.
A long, straight wire with current $I_1$, is placed $1.5\text{ cm}$ from a square loop wire with current $I_2$, Figure C1(c). Calculate current $I_2$, if the resultant magnetic force acting on the loop due to the straight wire is $-24.5,\mu\text{N}$.
[Diagram: A square loop on the left with current $I_2$ flowing counter-clockwise (arrow pointing left on the bottom side). To the right is a long straight vertical wire with $I_1 = 9.0\text{ A}$ flowing upward. The distance from the left side of the loop to the wire is labeled $1.5\text{ cm}$. The width of the square loop is labeled $4.0\text{ cm}$.]
Rajah C1(c) Figure C1(c)
(6 markah/marks)
18/23
Verbatim transcription via Kimi K2.6 vision subagents.