Instructions to candidates:

DO NOT OPEN THIS QUESTION PAPER UNTIL YOU ARE TOLD TO DO SO.Answer all questions in Section A. Marks will not be deducted for wrong answers. For each

question, four suggested answers are given. Choose the most suitable answer and mark the answeron the objective Answer Sheet provided.

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 paperand arrange your answers in numerical order.Use the data from the data sheet in page 10 .

Values of constants are provided on page 10 in this question paper.

PAPER 2 (KERTAS 2) 960/2

One and a half hours (Satu jam sete ngah)

Name : ____________________________ Class :___________________

confidential960/1Physics1 hours 30 minutes

SEK. MEN. KEB. TINGGI MELAKA(Malacca High School. Estd.1826)Ke Arah Kecemerlangan Pendidikan

STPM 2013 TRIAL EXAMINATION SEMESTER 2

PHYSICS

Prepared by : Verified by :

____________________________ ___________________

Wee Choi Chiang Julie Yap Azmi Bin SakmisGuru Fizik PK Tingkatan 6

This question paper consists of 10 printed pages.

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Section B [15 marks]Answer all questions in this section in the space provided.

16. (a) Define capacitance of a capacitor. [1]

(b) Explain the effect of dielectric on the capacitance of a parallel plate capacitors. [2]

(c) An isolated charged parallel plates capacitor of capacitance 20.0 µF is filled with adielectric of dielectric constant 10.0 and is charged by a battery of e.m.f. 12.0V as shownin Figure 1 below. The dielectric is then pulled out from the capacito r until half only halfof the space is filled with the dielectric as shown in Figure 2.

(i) Calculate the new capacitance of the capacitor. [2]

(ii) Calculate the final potential difference across the capacitor. [2]

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+++++++

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Figure 1 Figure 2

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17. (a) A sinusoidal voltage V= 200 sin(100π t) is supplied to a pure resistance of 100 Ω.

(i) Calculate the root mean square current through the resistor. [2]

(ii) Calculate the average rate of heat dissipated in the resistor. [2]

(b) If the same voltage is supplied to a pure capacitor of capacitance 40.0 µF,(i) calculate the reactance of the capacitor. [2]

(ii) calculate the root mean square current through the capacitor. [2]

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Section C [30 marks]

Answer ANY TWO QUESTION ONLY from this section in your own answer sheets.

18. (a) Explain what is meant by drift velocity of free electrons in a metal conductor. [1]

(b) (i) A potential difference of 2.00V is supplied to a constantan wire of l ength 60.0 cm anddiameter 0.400 mm. If the resistivity of constantan is 5.00x10 -7 Ωm and the density of freeelectrons in constantan is 4.00x10 28 m-3 , calculate the drift velocity of free electrons in theconstantan wire. [4]

(ii) Owing to heating effect, the temperature of the constantan wire increases, explain theeffect on the drift velocity of the free electrons. [2]

(c) In the circuit below, E1= 6.0 V, E2 =5.0 V, E3=4.0 V, R1 =100 Ω and R2= 50 Ω

(i) Find the current in each resistor. [6]

(ii) Calculate the potential difference between a and b. [2]

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19. (a) Define magnetic flux density. [2](b) A charged particle travelling with a speed of 1.00x10 6 m/sec enters a magnetic field of 0.0500

T. The particle is deflected as shown in the diagram below, and travels in a circular path ofradius 20.0 cm.

vo

(i) State whether the particle carries positive charge or negative charge. [1] (ii) Determine the specific charge (ratio of q/m) for the particle. [3]

(ii) If an electric field is applied to the same region with the magnetic field, the chargedparticle will travel through the region without any deflection. Determine the direction andmagnitude of the electric field. [3]

(c) (i) Account for the production of a Hall voltage when a thin strip of a metal conductor,carrying a current, is placed in a magnetic field. [3]

(ii) A flat copper ribbon 0.330 mm thick carries a steady current of 50.0 A and is located in auniform magnetic field of 1.30 T directed perpendicular to the plane of the ribbon. If a Hallvoltage of 9.60 μV is measured across the ribbon, what is the charge density of the freeelectrons? [3]

20. (a) Define magnetic flux linkage. [1] (b) State the laws of electromagnetic induction. [2]

(c) A square coil of side 5.00 cm lies perpendicular to a magnetic field of magnetic flux density 4.0 T asshown in the diagram below. The coil consists of 200 turns of wire and total resistance of 5.00 Ω.

(i) What is the magnetic flux linkage cutting the coil? [1]

If the coil is rotated about its axis of rotation through an angle of 90o in 0.200 seconds.

(ii) Calculate the magnitude of the average e.m.f. induced in the coil while i t is being rotated.[2]

(iii) Calculate the magnitude of the induced current flowing in the coil. [1](iv) What is the direction of the induced current in the coil. Explain your answer qualitatively.

[3] (v) Calculate the amount of heat dissipated in the coil. [1] (vi) If the coil is rotated continuously with a frequency of 50 Hz, determine the root mean square

current produced in the coil. [4]

x x x x x x

x x x x x x

x x x x x x

x x x x x x

x x x

x x x

Axis of rotation

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