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Electromagnetic Induction · CAPE Physics Unit 2

67 past-paper questions on Electromagnetic Induction, part of Electricity and Magnetism, from every CAPE Physics Unit 2 paper on Quelpr.

Practise Electromagnetic Induction
  1. 5(a)5 marks· CAPE Physics Unit 2 · 2001 · Paper 1With the aid of a labelled diagram explain the principle of operation of an ideal transformer.
  2. 4(c)(i)2 marks· CAPE Physics Unit 2 · 2002 · Paper 2Calculate the induced e.m.f. in the loop.
  3. 4(d)4 marks· CAPE Physics Unit 2 · 2002 · Paper 2The magnetic field is held at a constant value B, and the coil is rotated at 10 rev s^-1 with its plane initially parallel to B. A voltmeter connected via rotating contacts reads a peak value of 13.0 mV. Find the…
  4. 6(c)(ii)2 marks· CAPE Physics Unit 2 · 2002 · Paper 2Determine the turns ratio Ns / Np for EACH transformer, S and T.
  5. 2(a)(i)1 mark· CAPE Physics Unit 2 · 2003 · Paper 1Define magnetic flux.
  6. 2(b)(i)1 mark· CAPE Physics Unit 2 · 2003 · Paper 1State Faraday's Law.
  7. 2(b)(ii)1 mark· CAPE Physics Unit 2 · 2003 · Paper 1State Lenz's Law.
  8. 2(c)(i)2 marks· CAPE Physics Unit 2 · 2003 · Paper 1Find the area of the triangle formed at 2 seconds by the conducting bar and the conducting rods.
  9. 2(c)(ii)2 marks· CAPE Physics Unit 2 · 2003 · Paper 1Find the magnetic flux through the triangle at 2 seconds.
  10. 2(c)(iii)2 marks· CAPE Physics Unit 2 · 2003 · Paper 1Find the electromotive force (e.m.f.) induced in the moving rod at 2 seconds.
  11. 7(b)7 marks· CAPE Physics Unit 2 · 2003 · Paper 2Explain the operation of an ideal transformer when a small alternating voltage is supplied to its primary winding.
  12. 7(c)(i)2 marks· CAPE Physics Unit 2 · 2003 · Paper 2Calculate the turns ratio, N_p / N_s, of the transformer.
  13. 5(a)(i)4 marks· CAPE Physics Unit 2 · 2004 · Paper 1With the aid of a labelled diagram, explain the operation of an ideal transformer.
  14. 5(a)(ii)1 mark· CAPE Physics Unit 2 · 2004 · Paper 1Write down an expression relating Np, Ns, Vp, and Vs for a transformer.
  15. 5(b)(i)1 mark· CAPE Physics Unit 2 · 2004 · Paper 1Calculate the voltage across the secondary windings when the switch is open.
  16. 5(b)(ii)4 marks· CAPE Physics Unit 2 · 2004 · Paper 1Calculate the currents in the primary and secondary windings when the switch is closed.
  17. 2(a)(i)4 marks· CAPE Physics Unit 2 · 2004 · Paper 2Plot a graph of input voltage, V_i, against output voltage, V_o, on the grid provided on page 7.
  18. 2(a)(ii)2 marks· CAPE Physics Unit 2 · 2004 · Paper 2Use the graph to determine the turns ratio of the transformer.
  19. 2(a)(iii)1 mark· CAPE Physics Unit 2 · 2004 · Paper 2Calculate the number of turns in the primary windings if the number of turns in the secondary windings is 30 000.
  20. 3(a)(i)1 mark· CAPE Physics Unit 2 · 2005 · Paper 1State Faraday's law of electromagnetic induction.
  21. 3(a)(ii)1 mark· CAPE Physics Unit 2 · 2005 · Paper 1State Lenz's Law.
  22. 3(b)2 marks· CAPE Physics Unit 2 · 2005 · Paper 1Giving an example, explain how Lenz's law can be considered as an application of the law of conservation of energy.
  23. 3(c)(i)2 marks· CAPE Physics Unit 2 · 2005 · Paper 1Calculate the magnetic flux through each turn of the coil.
  24. 3(c)(ii)2 marks· CAPE Physics Unit 2 · 2005 · Paper 1If the electromagnet is turned off and it takes 0.20 s for the field to go down to zero, what would be the e.m.f. induced in the coil of wire?
  25. 3(c)(iii)2 marks· CAPE Physics Unit 2 · 2005 · Paper 1State TWO reasons why transformers are NOT usually 100 per cent efficient.
  26. 5(d)5 marks· CAPE Physics Unit 2 · 2005 · Paper 2Calculate the velocity, v, of the strip.
  27. 6(a)8 marks· CAPE Physics Unit 2 · 2005 · Paper 2Draw a labelled diagram of a transformer suitable for transforming from 240 V a.c. to 12 V a.c. Give details of the materials used in its structure and reasons for their choice.
  28. 6(b)(ii)2 marks· CAPE Physics Unit 2 · 2005 · Paper 2Calculate the turns ratio N_p / N_s of the transformer.
  29. Q151 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1The diagram shows a piece of wire 0.5\text{ m} long moving with a speed of 3.0\text{ m s}^{-1} perpendicular to a magnetic field of field strength 1.5\text{ mT}. What is the e.m.f. induced across the ends of the…
  30. Q191 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1An ideal transformer has N_s turns in its secondary coil and N_p turns in its primary coil. The alternating voltages in the secondary and primary coils are V_s and V_p respectively and the alternating currents…
  31. Q121 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1A wire of length 0.5\text{ m} and resistance 5\ \Omega moves vertically with a velocity of 10\text{ m s}^{-1} perpendicular to a uniform magnetic field of flux density 4.0 \times 10^{-5}\text{ T}. What is the…
  32. Q151 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1The diagram illustrate a demonstration of Lenz's law of electromagnetic induction. In which diagram is the current in the correct direction?
  33. 4(a)2 marks· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 2Define magnetic flux and state Lenz's law.
  34. 4(b)(i)2 marks· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 2Explain why the ring jumps into the air.
  35. 4(b)(ii)2 marks· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 2Describe and explain the motion of the ring, if any, when a slot is cut into the ring as shown in Figure 4(b).
  36. 4(c)(i)2 marks· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 2Calculate the total magnetic flux \Phi through the coil at time t = 0.
  37. 4(c)(ii)a)3 marks· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 2Given the rate of change of flux is 2\pi f \Phi \sin(2\pi f t), find the maximum instantaneous value of the induced e.m.f. in the coil.
  38. 4(c)(iii)2 marks· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 2State what difference it would make to the induced e.m.f. if the coil were fixed and the magnet rotated at the same rate and in the same direction.
  39. Q101 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1The SI unit of magnetic flux is the
  40. Q141 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1Item 14 refers to the following diagram. The iron core of a transformer is laminated because
  41. 1(a)(i)2 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2With the aid of a diagram explain the meaning of the term 'magnetic flux'.
  42. 1(a)(iii)1 mark· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2State Faraday's law of electromagnetic induction.
  43. 1(b)(i)3 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Calculate the MAXIMUM value of the TOTAL flux linkage through the 16 turn coil.
  44. 1(b)(ii)2 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Find the peak value of the e.m.f. induced in the coil, given that the equation for the variation of the flux linkage is \Phi = \Phi_0 \sin 2\pi f t.
  45. 1(b)(iii)4 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Show on Figure 2 (b) the c.r.o. trace expected if the number of turns wrapped around the solenoid was increased to 32, and on Figure 2 (c) show the effect of changing the frequency of the supply to the solenoid to 1000…
  46. 1(b)(iv)2 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Describe briefly how you could show that the induced e.m.f. depends on the area of the coil.
  47. Q141 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1Item 14 refers to the following diagram. The iron core of a transformer is laminated because
  48. 4(a)(ii)1 mark· CAPE Physics Unit 2 · 2009 · Paper 2State Faraday's law of electromagnetic induction.
  49. 4(a)(iii)1 mark· CAPE Physics Unit 2 · 2009 · Paper 2State Lenz's law.
  50. 4(b)(i)2 marks· CAPE Physics Unit 2 · 2009 · Paper 2Explain why an e.m.f. is generated between the axle and the rim of the disc as it rotates.
  51. 4(b)(ii)b)2 marks· CAPE Physics Unit 2 · 2009 · Paper 2Calculate the magnetic flux cut by the disc in every revolution.
  52. 4(b)(ii)c)2 marks· CAPE Physics Unit 2 · 2009 · Paper 2Calculate the potential difference maintained between the rim and the axle of the disc.
  53. 4(c)3 marks· CAPE Physics Unit 2 · 2009 · Paper 2Describe how the apparatus in Figure 5 could verify Faraday's law: sketch the expected graph of e.m.f. versus motor speed, explain how the conclusion is drawn from the graph, and state which factors must be held…
  54. Q141 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1The iron core of a transformer is laminated because
  55. Q151 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1An ideal transformer has 600 turns in the primary winding and 40 turns in the secondary winding. If the current in the primary winding is 5\text{ A}, and the primary voltage is 120\text{ V}, what is the current and…
  56. Q141 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1The iron core of the transformer in the diagram above is laminated because
  57. Q141 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1The iron core of a transformer is laminated because
  58. Q151 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1The diagrams below show a bar magnet being inserted or withdrawn from a solenoid. In which diagram is the current flow correct?
  59. Q151 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1An ideal transformer has 600 turns in the primary winding and 40 turns in the secondary winding. If the current in the primary winding is 5\text{ A}, and the primary voltage is 120\text{ V}, what are the current…
  60. Q131 mark · multiple choice· CAPE Physics Unit 2 · 2015 · Paper 1A uniform magnetic field of flux density, Z, passes normally through the area, Y. Within this area lies a coil of 64 turns of copper wire, each of area \frac{1}{8}Y. What is the magnetic flux linkage for this…
  61. Q151 mark · multiple choice· CAPE Physics Unit 2 · 2016 · Paper 1One of its poles lies within a short cylindrical coil as shown. The magnet is displaced slightly so that one pole of the magnet oscillates within the coil. Which of the following graphs illustrates how the…
  62. Q111 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1An ideal transformer has 600 turns in the primary winding and 40 turns in the secondary winding. If the current in the primary winding is 5\text{ A}, and the primary voltage is 120\text{ V}, what is the current…
  63. Q151 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1Which of the following diagrams represents a step-down transformer?
  64. Q151 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1One of its poles lies within a short cylindrical coil as shown. The magnet is displaced slightly so that one pole of the magnet oscillates within the coil. Which of the following graphs illustrates how the…
  65. Q161 mark · multiple choice· CAPE Physics Unit 2 · 2019 · Paper 1Which of the following diagrams represents a step-down transformer?
  66. 1(e)(i)2 marks· Physics · Unit 2 Q1 1(e)(i)State Lenz's law.
  67. 1(e)(ii)5 marks· Physics · Unit 2 Q1 1(e)(ii)Describe a simple experiment that can be performed to demonstrate Lenz's law.

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