Magnetic Forces · CAPE Physics Unit 2

83 past-paper questions on Magnetic Forces, part of Electricity and Magnetism, from every CAPE Physics Unit 2 paper on Quelpr.

1. 2(a)(i)1 mark· CAPE Physics Unit 2 · 2001 · Paper 1Indicate on Figure 2 the direction of the velocity of the charged particle, v.
2. 2(a)(ii)1 mark· CAPE Physics Unit 2 · 2001 · Paper 1Indicate on Figure 2 the direction of the magnetic force acting on the charge particle, F.
3. 2(b)4 marks· CAPE Physics Unit 2 · 2001 · Paper 1Explain why the magnetic field does not affect the kinetic energy of the charged particle.
4. 2(c)(i)3 marks· CAPE Physics Unit 2 · 2001 · Paper 1Calculate the orbital speed of the proton.
5. 2(c)(ii)1 mark· CAPE Physics Unit 2 · 2001 · Paper 1Calculate the period of revolution of the proton.
6. 3(a)(ii)1 mark· CAPE Physics Unit 2 · 2001 · Paper 2Explain how to determine the sign of the charge of a β-particle.
7. 5(a)8 marks· CAPE Physics Unit 2 · 2001 · Paper 2Give a detailed explanation of the origin of the Hall effect and define the Hall potential difference. Include a diagram clearly showing relevant vector quantities for a specimen in which electron conduction…
8. 5(b)(i)7 marks· CAPE Physics Unit 2 · 2001 · Paper 2A p.d. of 8.75 mV is produced across its edges. Given that the magnitude of charge of each carrier is 1.6 × 10^(-19) C, calculate the number of charge carriers per unit volume, explaining your calculation.
9. 5(b)(ii)5 marks· CAPE Physics Unit 2 · 2001 · Paper 2Deduce what type of material is best suited for a large Hall potential difference, and describe how the magnitude of the magnetic field and the thickness of the material affect the Hall potential difference.
10. 5(d)(i)2 marks· CAPE Physics Unit 2 · 2003 · Paper 2Calculate the average force experienced by EACH electron due to the field.
11. 5(d)(ii)3 marks· CAPE Physics Unit 2 · 2003 · Paper 2Calculate the TOTAL force experienced by the wire due to the field.
12. 2(b)(i)1 mark· CAPE Physics Unit 2 · 2004 · Paper 1Mark with a P the approximate region on Figure 2c where the resultant magnetic field is zero.
13. 2(b)(ii)3 marks· CAPE Physics Unit 2 · 2004 · Paper 1Calculate the distance of P from the wire carrying the current of 5 A.
14. 7(a)(ii)3 marks· CAPE Physics Unit 2 · 2004 · Paper 1On Figure 7, sketch and label the paths of the three types of radiation (alpha, beta, gamma) as they travel through the magnetic field directed into the paper.
15. 5(a)3 marks· CAPE Physics Unit 2 · 2004 · Paper 2Explain, with the aid of a diagram, Fleming's Left Hand Rule.
16. 5(b)(i)3 marks· CAPE Physics Unit 2 · 2004 · Paper 2Copy Figure 5 into your answer booklet and draw the path of the electron as it passes through the magnetic field. On the same diagram, draw the path if the electron is replaced with a proton.
17. 5(b)(ii)2 marks· CAPE Physics Unit 2 · 2004 · Paper 2Explain what work is done on the electron as it passes through the magnetic field.
18. 5(b)(iii)3 marks· CAPE Physics Unit 2 · 2004 · Paper 2Show that the path described by the electron in the magnetic field is a circle of radius r given by r = mv / (Be), where m is mass of electron and e is electron charge.
19. 5(b)(iv)2 marks· CAPE Physics Unit 2 · 2004 · Paper 2On the Figure 5 copied in your answer booklet, draw the path of the electron if the magnetic field B was reduced to half its value.
20. 5(c)7 marks· CAPE Physics Unit 2 · 2004 · Paper 2Determine the mass, m_x, of the second particle.
21. 1(a)1 mark· CAPE Physics Unit 2 · 2005 · Paper 2Complete the third column of Table 1 by calculating I^2 / (A^2 * 10^-4).
22. 1(b)5 marks· CAPE Physics Unit 2 · 2005 · Paper 2On the grid provided on page 5, plot a graph of Added Weight, F, versus I^2.
23. 1(c)4 marks· CAPE Physics Unit 2 · 2005 · Paper 2Use your graph to determine a value for the permeability of free space, mu_0.
24. 5(a)8 marks· CAPE Physics Unit 2 · 2005 · Paper 2Explain the origin of the Hall effect, including a diagram showing clearly the directions of the Hall voltage and other relevant quantities for a specimen in which electron conduction predominates.
25. 5(b)2 marks· CAPE Physics Unit 2 · 2005 · Paper 2A Hall probe gives a Hall voltage of 130 mV in a known magnetic field of 15 mT. Calculate the unknown magnetic field strength when the probe measures 1170 mV.
26. 5(c)(i)2 marks· CAPE Physics Unit 2 · 2005 · Paper 2Draw a labelled diagram to show the relationship between the two fields.
27. 5(c)(ii)3 marks· CAPE Physics Unit 2 · 2005 · Paper 2Write equations for the forces on the ions caused by the electric field and the magnetic field and hence calculate the electric field strength E.
28. 7(b)(i)3 marks· CAPE Physics Unit 2 · 2006 · Paper 1Derive an expression for the radius R of the circular path of a particle with mass m and charge q travelling at speed v perpendicular to a uniform magnetic field of flux density B.
29. 7(b)(ii)3 marks· CAPE Physics Unit 2 · 2006 · Paper 1An alpha particle and a beta particle move at the same speed perpendicular to the same magnetic field. If the radius of the alpha particle's path is 0.40 m, calculate the radius of the beta particle's path.
30. 4(c)3 marks· CAPE Physics Unit 2 · 2006 · Paper 2The beam of protons in (b) is to be deflected around a curve of radius 2.0\text{ m}. If the magnetic field is perpendicular to the beam, calculate its field strength.
31. 5(a)(iii)3 marks· CAPE Physics Unit 2 · 2006 · Paper 2Figure 5 shows two long parallel wires, both of length l, separated by a distance r, carrying currents I_1 and I_2 in opposite directions. Show that the force between the two wires is given by…
32. 5(b)(i)4 marks· CAPE Physics Unit 2 · 2006 · Paper 2Calculate the current through the wire.
33. 5(b)(ii)2 marks· CAPE Physics Unit 2 · 2006 · Paper 2The sensitivity of the balance is 0.1 \times 10^{-6}\text{ N}. Calculate the minimum current detectable using this balance.
34. 1(a)1 mark· CAPE Physics Unit 2 · 2007 · Paper 2State why an ammeter and a rheostat were included in the solenoid circuit.
35. Q131 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1An electron beam moving with speed v enters a uniform magnetic field B, acting down the page as shown. The beam of electrons will bend
36. Q141 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1Which diagram correctly shows the direction of the forces acting on adjacent current carrying conductors?
37. Q141 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1What will be the approximate ratio of the paths r_p : r_e where r_p and r_e are the radius of the path of the proton and electron respectively?
38. Q151 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1Why does a transformer have a core made of iron?
39. Q91 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1Which of the following diagrams shows the correct direction of the forces on two wires carrying current in opposite directions?
40. Q111 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1A current-carrying conductor of mass 2 \times 10^{-2}\text{ kg} carrying a current of 2.0\text{ A} is balanced in a magnetic field. If the length of the conductor is 8\text{ cm}, determine the magnetic field…
41. Q111 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1Consider a current-carrying conductor, XY, placed between the poles of a magnet as shown below. In which orientation would the wire experience the greater force?
42. Q131 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1Item 13 refers to the diagram below which shows a rectangular coil, resting on points. Part of the coil is between North and South poles of magnets, as shown. A small mass, m, rests on the shaft PQ. The coil is in…
43. Q111 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1A wire carrying current into the plane of the paper is shown below. It is acted upon, in turn, by four magnetic fields acting in the directions shown. Which field exerts on the wire a force towards point P?
44. Q121 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1A conductor of length 0.10\text{ m} is placed in a magnetic field of 9\text{ mT} at an angle of 60^\circ to the field direction. It has a current of 2\text{ A}. Calculate the force on the conductor due to the…
45. Q101 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1A wire of length 30\text{ cm} is in a magnetic field of strength 3.5\text{ mT} and makes an angle of 60^\circ with the field. If the wire is carrying a current of 2.5\text{ A}, what is the magnitude of the force…
46. Q111 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1A wire carrying current into the plane of the paper is shown below. It is acted upon, in turn, by four magnetic fields labelled A, B, C and D acting in the directions shown. Which field exerts on the wire a force…
47. Q121 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1A current-carrying conductor of mass 2.0 \times 10^{-3}\text{ kg} carrying a current of 2.0\text{ A} is balanced by a magnetic field at right angles to it. If the length of the conductor is 8.0\text{ cm}, the…
48. 1(b)4 marks· CAPE Physics Unit 2 · 2011 · Paper 2Draw the resultant magnetic field pattern between the two flat permanent magnets in Figure 1 (b) with wire P carrying current perpendicularly into the plane of the paper, and indicate the direction of motion of the wire…
49. 1(c)(i)1 mark· CAPE Physics Unit 2 · 2011 · Paper 2State the direction of the magnetic field.
50. 1(c)(ii)4 marks· CAPE Physics Unit 2 · 2011 · Paper 2By considering the forces on EACH electron, show that the magnetic flux density is given by B = V / (v d).
51. 1(c)(iii)2 marks· CAPE Physics Unit 2 · 2011 · Paper 2Given that V = 3500 V, v = 2.8 * 10^7 m s^-1, and d = 50 mm, calculate the magnetic flux density of the magnetic field.
52. 1(c)(iv)2 marks· CAPE Physics Unit 2 · 2011 · Paper 2The magnetic flux density is now doubled. The distance between the plates is then adjusted so that no deflection occurs. Calculate the new distance.
53. Q111 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1Which of the following diagrams shows the correct direction of the forces on two wires carrying current in opposite directions?
54. Q121 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1A conductor of length 0.10\text{ m} is placed in a magnetic field of 9\text{ mT} at an angle of 60^\circ to the field direction. It has a current of 2\text{ A}. Calculate the force on the conductor due to the…
55. Q131 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1What is the direction of the resultant force on P when the magnetic field shown is switched on?
56. 1(a)(i)2 marks· CAPE Physics Unit 2 · 2012 · Paper 2Mark on Figure 1 the direction of current in wire AB and state the name of the rule used to determine this direction.
57. 1(b)(i)3 marks· CAPE Physics Unit 2 · 2012 · Paper 2Show that at equilibrium, the current through the circuit is given by I = mgx / (BLy), where L is the length of wire AB.
58. 1(b)(ii)3 marks· CAPE Physics Unit 2 · 2012 · Paper 2Describe how the apparatus is used to obtain a set of readings for I and x, stating clearly how results are taken.
59. 1(c)(i)1 mark· CAPE Physics Unit 2 · 2012 · Paper 2Draw the best straight line through the data plotted in Figure 2.
60. 1(c)(ii)2 marks· CAPE Physics Unit 2 · 2012 · Paper 2Determine the gradient of the best line drawn on Figure 2.
61. 1(c)(iii)3 marks· CAPE Physics Unit 2 · 2012 · Paper 2Given that y = 2.0 cm, L = 5.0 cm, and m = 0.50 g, calculate the magnetic flux density, B, of the magnet.
62. Q101 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1A wire carrying current into the plane of the paper is shown below. It is acted upon, in turn, by four magnetic fields acting in the directions shown. Which field exerts on the wire a force towards point P?
63. Q121 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1Which of the following diagrams shows the correct direction of the forces on two wires carrying current in opposite directions?
64. 4(b)(ii)a)2 marks· CAPE Physics Unit 2 · 2013 · Paper 2Explain the effect on the electron's horizontal velocity component, resulting from its interaction with the B-field.
65. 4(b)(ii)b)2 marks· CAPE Physics Unit 2 · 2013 · Paper 2Describe the effect on the electron's vertical velocity component.
66. 4(b)(ii)c)4 marks· CAPE Physics Unit 2 · 2013 · Paper 2Describe the resultant motion of the electrons and the nature of the image produced on the phosphorescent screen when the B-field is large enough to prevent the electrons from touching the interior of the solenoid.
67. Q121 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1A conductor of length 0.10\text{ m} is placed in a magnetic field of strength 9\text{ mT} at an angle of 60^\circ to the field direction. If it has a current of 2\text{ A}, then the force on the conductor due to…
68. Q131 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1Consider a current-carrying conductor, XY, placed between the poles of a magnet as shown below. In which orientation would the wire experience the GREATEST force?
69. Q121 mark · multiple choice· CAPE Physics Unit 2 · 2015 · Paper 1Which of the following diagrams shows the correct direction of the forces on two wires carrying current in opposite directions?
70. 4(b)(ii)3 marks· CAPE Physics Unit 2 · 2015 · Paper 2Redraw Figure 7 and add to your drawing a rough sketch of the magnetic field of the current in Conductor A. Indicate by an arrow on the diagram, the direction of the force experienced by Conductor B due to the magnetic…
71. 4(c)(ii)2 marks· CAPE Physics Unit 2 · 2015 · Paper 2Determine the magnitude and direction of the force experienced by EACH centimetre of Wire B due to the magnetic field of the current in Wire A.
72. Q101 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1Item 10 refers to the following diagram of a wire of length 30\text{ cm} in a magnetic field of strength 3.5\text{ mT}, which makes an angle of 60^\circ with the field. [Diagram showing magnetic field B and a wire…
73. Q131 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1A straight wire 1\text{ m} long is placed at an angle of 30^\circ in a magnetic field of flux density 0.2\text{ T}. It experiences a force of 0.5\text{ N}. What is the current in the wire?
74. Q121 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1A conductor of length 0.10\text{ m} is placed in a magnetic field of strength 9\text{ mT} at an angle of 60^\circ to the field direction. If it has a current of 2\text{ A}, then the force on the conductor due to…
75. Q131 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1Consider a current-carrying conductor, \text{XY}, placed between the poles of a magnet as shown in the orientations below. In which orientation would the wire experience the GREATEST force?
76. Q141 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1Which of the following diagrams shows the correct direction of the forces on two wires carrying current in opposite directions?
77. Q331 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1What is the velocity of a beam of electrons when the simultaneous influence of an electric field of 1.7 \times 10^5\text{ V}\,\text{m}^{-1} and a magnetic field of 5.0 \times 10^{-3}\text{ T}, both perpendicular to…
78. 1(b)(i)6 marks· Physics · Unit 2 Q1 1(b)(i)Draw a fully labelled diagram to illustrate the direction of the force, F, acting on a straight conductor of length L carrying a current, I, at an angle, θ, to a uniform magnetic field of flux density, B.
79. 1(b)(ii)2 marks· Physics · Unit 2 Q1 1(b)(ii)Write the expression for the force, F, experienced per unit length of the conductor in terms of B, I, L and θ.
80. 1(b)(iii)3 marks· Physics · Unit 2 Q1 1(b)(iii)Calculate the magnitude of the magnetic force experienced by the wire.
81. 1(d)(i)3 marks· Physics · Unit 2 Q1 1(d)(i)Determine an expression for the magnitude of the force acting on the electron.
82. 1(d)(ii)3 marks· Physics · Unit 2 Q1 1(d)(ii)Determine an expression for the radius of this path.
83. 1(d)(iii)2 marks· Physics · Unit 2 Q1 1(d)(iii)Calculate the radius of the path.