Candidate Number. General Certificate of Education Advanced Level Examination June 2010
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1 Centre Number Surname Candidate Number For Examiner s Use Other Names Candidate Signature Examiner s Initials General Certificate of Education Advanced Level Examination June 2010 Question 1 2 Mark Physics A Unit 4 Fields and Further Mechanics Section B Friday 18 June am to am PHYA4/ TOTAL For this paper you must have: a calculator a ruler a Data and Formulae Booklet. Time allowed The total time for both sections of this paper is 1 hour 45 minutes. You are advised to spend approximately one hour on this section. Instructions Use black ink or black ball-point pen. Fill in the es at the top of this page. Answer all questions. You must answer the questions in the spaces provided. Answers written in margins or on blank pages will not be marked. Do all rough work in this book. Cross through any work you do not want to be marked. Information The marks for questions are shown in brackets. The maximum mark for this section is 50. You are expected to use a calculator where appropriate. A Data and Formulae Booklet is provided as a loose insert. You will be marked on your ability to: use good English organise information clearly use specialist vocabulary where appropriate. (JUN10PHYA4201) PHYA4/2
2 2 Answer all questions. You are advised to spend approximately one hour on this section. 1 (a) State Newton s law of gravitation. 1 (b) In 1798 Cavendish investigated Newton s law by measuring the gravitational force between two unequal uniform lead spheres. The radius of the larger sphere was 100 mm and that of the smaller sphere was 25 mm. 1 (b) (i) The mass of the smaller sphere was 0.74 kg. Show that the mass of the larger sphere was about 47 kg. density of lead = kg m 3 1 (b) (ii) Calculate the gravitational force between the spheres when their surfaces were in contact. answer =... N (02)
3 3 1 (c) Modifications, such as increasing the size of each sphere to produce a greater force between them, were considered in order to improve the accuracy of Cavendish s experiment. Describe and explain the effect on the calculations in part (b) of doubling the radius of both spheres. (4 marks) 10 Turn over for the next question Turn over (03)
4 4 2 A small negatively charged sphere is suspended from a fine glass spring between parallel horizontal metal plates, as shown in Figure 1. Figure 1 small hole in top plate fine glass spring X S high voltage dc supply Y charged sphere plates 2 (a) Initially the plates are uncharged. When switch S is set to position X, a high voltage dc supply is connected across the plates. This causes the sphere to move vertically upwards so that eventually it comes to rest 18 mm higher than its original position. 2 (a) (i) State the direction of the electric field between the plates. (1 mark) 2 (a) (ii) The spring constant of the glass spring is 0.24 N m 1. Show that the force exerted on the sphere by the electric field is N. (1 mark) (04)
5 5 2 (a) (iii) The pd applied across the plates is 5.0 kv. If the charge on the sphere is C, determine the separation of the plates. 2 (b) Switch S is now moved to position Y. answer =... m (3 marks) 2 (b) (i) State and explain the effect of this on the electric field between the plates. 2 (b) (ii) With reference to the forces acting on the sphere, explain why it starts to move with simple harmonic motion. (3 marks) 10 Turn over (05)
6 6 3 Deep space probes often carry modules which may be ejected from them by an explosion. A space probe of total mass 500 kg is travelling in a straight line through free space at 160 m s 1 when it ejects a capsule of mass 150 kg explosively, releasing energy. Immediately after the explosion the probe, now of mass 350 kg, continues to travel in the original straight line but travels at 240 m s 1, as shown in Figure 2. Figure m s m s kg 150 kg 350 kg probe capsule probe before explosion after explosion 3 (a) Discuss how the principles of conservation of momentum and conservation of energy apply in this instance. The quality of your written communication will be assessed in this question. (6 marks) (06)
7 7 3 (b) (i) Calculate the magnitude of the velocity of the capsule immediately after the explosion and state its direction of movement. magnitude of velocity =... m s 1 direction of movement... (3 marks) 3 (b) (ii) Determine the total amount of energy given to the probe and capsule by the explosion. answer =... J (4 marks) 13 Turn over for the next question Turn over (07)
8 8 4 When travelling in a vacuum through a uniform magnetic field of flux density 0.43 mt, an electron moves at constant speed in a horizontal circle of radius 74 mm, as shown in Figure 3. region of uniform magnetic field Figure 3 x +z +y horizontal plane y z +x 74 mm electron 4 (a) When viewed from vertically above, the electron moves clockwise around the horizontal circle. In which one of the six directions shown on Figure 3, +x, x, +y, y, +z or z, is the magnetic field directed? direction of magnetic field... (1 mark) 4 (b) Explain why the electron is accelerating even though it is travelling at constant speed. (08)
9 9 4 (c) (i) By considering the centripetal force acting on the electron, show that its speed is ms 1. 4 (c) (ii) Calculate the angular speed of the electron, giving an appropriate unit. answer =... 4 (c) (iii) How many times does the electron travel around the circle in one minute? answer =... 9 Turn over (09)
10 10 5 Figure 4 shows an end view of a simple electrical generator. A rectangular coil is rotated in a uniform magnetic field with the axle at right angles to the field direction. When in the position shown in Figure 4 the angle between the direction of the magnetic field and the normal to the plane of the coil is θ. Figure 4 axle coil θ uniform magnetic field normal 5 (a) The coil has 50 turns and an area of m 2. The flux density of the magnetic field is T. Calculate the flux linkage for the coil when θ is 35, expressing your answer to an appropriate number of significant figures. answer =... Wb turns (3 marks) (10)
11 11 5 (b) The coil is rotated at constant speed, causing an emf to be induced. 5 (b) (i) Sketch a graph on the outline axes to show how the induced emf varies with angle θ during one complete rotation of the coil, starting when θ = 0. Values are not required on the emf axis of the graph. (1 mark) induced emf θ/ 5 (b) (ii) Give the value of the flux linkage for the coil at the positions where the emf has its greatest values. answer =... Wb turns (1 mark) 5 (b) (iii) Explain why the magnitude of the emf is greatest at the values of θ shown in your answer to part (b)(i). (3 marks) END OF QUESTIONS 8 (11)
12 12 There are no questions printed on this page DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED Copyright 2010 AQA and its licensors. All rights reserved. (12)
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