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Electric Fields · CAPE Physics Unit 2

115 past-paper questions on Electric Fields, part of Electricity and Magnetism, from every CAPE Physics Unit 2 paper on Quelpr.

Practise Electric Fields
  1. 1(a)3 marks· CAPE Physics Unit 2 · 2001 · Paper 1State THREE properties of the electrostatic force between two stationary, charged particles.
  2. 1(b)1 mark· CAPE Physics Unit 2 · 2001 · Paper 1Write an equation to express the magnitude of the electric force between two charges.
  3. 1(c)(i)1 mark· CAPE Physics Unit 2 · 2001 · Paper 1Locate on Figure 1 the forces F₁ and F₂ acting on Q₃ due to Q₁ and Q₂, respectively.
  4. 1(c)(ii)2 marks· CAPE Physics Unit 2 · 2001 · Paper 1Calculate a value for F₁.
  5. 1(c)(iii)1 mark· CAPE Physics Unit 2 · 2001 · Paper 1Calculate a value for F₂.
  6. 1(c)(iv)2 marks· CAPE Physics Unit 2 · 2001 · Paper 1Hence calculate the magnitude of the resultant force acting on Q₃.
  7. 3(a)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1State Coulomb's law for electrostatic charges.
  8. 3(b)(i)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1Explain what is meant by electric field strength.
  9. 3(b)(ii)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1Explain what is meant by electric potential.
  10. 3(c)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1State how electric field strength and electric potential are related.
  11. 3(d)(i)5 marks· CAPE Physics Unit 2 · 2002 · Paper 1Calculate the electric field strength at the midpoint between the two charges.
  12. 3(d)(ii)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1Indicate on Figure 3, along the line joining the two point charges, the approximate position where the net electric field is zero.
  13. 4(a)2 marks· CAPE Physics Unit 2 · 2003 · Paper 2State Coulomb's law for electrostatic charges and define 'electric field'.
  14. 4(b)(i)a)2 marks· CAPE Physics Unit 2 · 2003 · Paper 2Explain why the pollen grain 'jumps' to the bee.
  15. 4(b)(i)b)1 mark· CAPE Physics Unit 2 · 2003 · Paper 2Explain why the pollen grain clings to the bee during the flight.
  16. 4(b)(i)c)2 marks· CAPE Physics Unit 2 · 2003 · Paper 2Explain why the pollen grain 'jumps' away from the bee to the stigma.
  17. 4(b)(ii)a)2 marks· CAPE Physics Unit 2 · 2003 · Paper 2Assuming that a bee with a charge of 45.0 x 10^-12 C is a spherical conductor, calculate the magnitude of the bee's electric field at the location of a pollen grain 1.5 cm from the bee's centre.
  18. 4(b)(ii)b)1 mark· CAPE Physics Unit 2 · 2003 · Paper 2State whether this field is uniform or non-uniform.
  19. 4(c)(i)5 marks· CAPE Physics Unit 2 · 2003 · Paper 2A spherical drop of water carrying a charge of 30 x 10^-12 C has a potential of 500 V at its surface. Calculate the radius of the drop.
  20. 4(c)(ii)5 marks· CAPE Physics Unit 2 · 2003 · Paper 2Two such drops of the same charge and radius combine to form a single spherical drop. Calculate the potential at the surface of the new drop.
  21. 9(a)(iii)3 marks· CAPE Physics Unit 2 · 2003 · Paper 2Draw a diagram to show the path of a stream of Beta particles and Gamma rays in a uniform electric field.
  22. 4(a)(i)3 marks· CAPE Physics Unit 2 · 2004 · Paper 2State THREE facts about the electrostatic force that exists between these point charges.
  23. 4(a)(ii)1 mark· CAPE Physics Unit 2 · 2004 · Paper 2Write an expression for the electric field experienced by charge q_2 due to charge q_1.
  24. 4(a)(iii)3 marks· CAPE Physics Unit 2 · 2004 · Paper 2Copy Figure 4a into your answer booklet and draw the resulting electric field lines. Indicate with an X the point where the resulting electric field is zero.
  25. 4(b)(i)7 marks· CAPE Physics Unit 2 · 2004 · Paper 2Find the value of d.
  26. 4(b)(ii)2 marks· CAPE Physics Unit 2 · 2004 · Paper 2State what assumption was made to calculate the value of d.
  27. 4(c)4 marks· CAPE Physics Unit 2 · 2004 · Paper 2Calculate the electric potential at point P located at the centre of the square. (Use Coulomb's constant 1/(4πε_0) = 9 × 10^9 N m^2 C^-2).
  28. 2(a)(i)a)1 mark· CAPE Physics Unit 2 · 2005 · Paper 1Write an expression for the electric field at B.
  29. 2(a)(i)b)1 mark· CAPE Physics Unit 2 · 2005 · Paper 1Write an expression for the electric potential at B.
  30. 2(a)(ii)1 mark· CAPE Physics Unit 2 · 2005 · Paper 1Show how the electric field and electric potential at B are related.
  31. 2(b)(i)1 mark· CAPE Physics Unit 2 · 2005 · Paper 1Explain why the uncharged sphere is attracted to the positive plate.
  32. 2(b)(ii)3 marks· CAPE Physics Unit 2 · 2005 · Paper 1Explain why the sphere subsequently oscillates between the plates.
  33. 2(b)(iii)3 marks· CAPE Physics Unit 2 · 2005 · Paper 1When the ball is not touching either plate, the force on the ball is 0.05 N. The plates are 10 cm apart and the supply voltage is set to 1 kV. Calculate the charge on the sphere.
  34. 3(a)2 marks· CAPE Physics Unit 2 · 2006 · Paper 1Describe briefly, with the aid of a diagram, a practical application of electrostatics.
  35. 3(b)2 marks· CAPE Physics Unit 2 · 2006 · Paper 1State why gowns worn in a hospital operating theatre are never made of synthetic materials such as nylon.
  36. 3(c)(i)1 mark· CAPE Physics Unit 2 · 2006 · Paper 1Complete the diagram in Figure 3 to show the electric field between the plates.
  37. 3(c)(ii)2 marks· CAPE Physics Unit 2 · 2006 · Paper 1Explain the process by which sparks pass through the air between the plates when the electric field is sufficiently strong.
  38. 3(c)(iii)3 marks· CAPE Physics Unit 2 · 2006 · Paper 1Calculate the maximum voltage that can be applied to the plates without causing electrical breakdown, given the breakdown field strength of dry air is 3 x 10^6 V m^-1.
  39. 8(b)3 marks· CAPE Physics Unit 2 · 2006 · Paper 1Calculate the speed of the electrons after being accelerated through a potential difference of 3000 V.
  40. 3(a)(i)2 marks· CAPE Physics Unit 2 · 2006 · Paper 2How much charge is on the drop of mass 3.9 \times 10^{-15}\text{ kg} when it is held stationary by a p.d. of 200\text{ V} between plates 10\text{ mm} apart?
  41. 4(b)(i)3 marks· CAPE Physics Unit 2 · 2006 · Paper 2Calculate the velocity of the protons.
  42. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1An electric field exists between charged parallel plates. Which graph shows how the electric field strength varies along the line OP?
  43. Q81 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1In the diagram below, a potential difference of 600\text{ V} is applied between two parallel metal plates, \text{X} and \text{Y}, 5\text{ mm} apart. What is the magnitude and direction of the electric field at…
  44. Q81 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1What is the ratio of the electric field strength at X, to the field strength at Y?
  45. Q91 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1The force per unit charge on a positive test charge placed at a point in a field is called
  46. Q71 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1An oil drop of mass 2 \times 10^{-14}\text{ kg} carries a charge Q. If the drop is stationary between two parallel plates 20\text{ mm} apart with a potential difference of 500\text{ V} between them, then the…
  47. Q81 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1A small positive charge is placed near a plate that is earthed. Which diagram shows the correct direction of the electric field?
  48. Q61 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1The work done per unit charge in bringing a small positive charge from infinity to a point is the definition of
  49. Q71 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1Item 7 refers to the following diagram. What is the force exerted on the electron shown travelling between two parallel plates with a potential difference of 800\text{ V} and plate separation of 0.05\text{ m}?
  50. 6(b)(i)2 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Draw a free body diagram showing the forces acting on the oil drop.
  51. 6(b)(ii)a)3 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Calculate the charge on the oil drop.
  52. 6(c)3 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2The potential of the upper plate is suddenly changed to -1.50 \times 10^3 V. Determine the initial acceleration of the charged drop.
  53. Q51 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1In SI, the unit of electric field is
  54. Q61 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1What is the electric potential of point X in the diagram below?
  55. Q71 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1Which of the following shows the possible path of a high speed electron through a uniform electric field?
  56. Q51 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1Which of the following CANNOT be inferred from Coulomb's law? The force between charges depends on
  57. Q61 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1The diagram shows a positively charged sphere Q suspended by a light insulated string placed between two metal plates X and Y. When the switch S is closed, the initial movement of the sphere is towards
  58. Q71 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1What is the electric potential 25\text{ cm} from a point charge of 6 \times 10^{-8}\text{ C}?
  59. 6(b)(ii)3 marks· CAPE Physics Unit 2 · 2010 · Paper 2Calculate the speed of the electrons when they hit the target.
  60. Q51 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1In SI, the unit of electric field strength is
  61. Q61 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1When the switch S, is closed, the initial movement of the sphere is
  62. Q71 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1Coulomb's law states that the force between two point charges is directly proportional to
  63. Q51 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1A proton is projected with velocity, v, between two parallel plates which have a potential difference of 400\text{ V} between them as shown above. While passing between the plates, the motion of the proton may be…
  64. Q61 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1The work done per unit charge in bringing a small positive charge from infinity to a point is the definition of
  65. Q71 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1What is the electric potential 25\text{ cm} from a point charge of 6 \times 10^{-8}\text{ C}?
  66. Q51 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1In SI, the unit of electric field strength is
  67. Q71 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1What is the electric potential 25\text{ cm} from a point charge of 6\times 10^{-8}\text{ C}?
  68. Q81 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1The work done per unit charge in bringing a small positive charge from infinity to a point is the definition of
  69. 4(a)(i)2 marks· CAPE Physics Unit 2 · 2013 · Paper 2By equating the gain in kinetic energy of the electrons to the work done in accelerating them, show that the velocity, v_e, of the emerging beam electrons is given by v_e = sqrt((2 e V_p) / m_e).
  70. 4(a)(ii)2 marks· CAPE Physics Unit 2 · 2013 · Paper 2Calculate the velocity of the electrons in the emerging electron beam when V_p = 25 kV.
  71. Q91 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1Coulomb's law states that the force between two point charges is directly proportional to
  72. Q101 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1Which of the following diagrams BEST describes the path of an electron travelling through an electric field?
  73. 4(a)3 marks· CAPE Physics Unit 2 · 2014 · Paper 2Define the term 'electric field strength' and state the unit in which it is measured.
  74. 4(b)2 marks· CAPE Physics Unit 2 · 2014 · Paper 2Two horizontal metal plates in vacuo are separated by 1\text{ cm} with a potential difference of 1\text{ kV} applied across them as shown in Figure 2. Calculate the electric field strength between the plates.
  75. 4(c)(i)1 mark· CAPE Physics Unit 2 · 2014 · Paper 2A beam of electrons is projected through a hole in the positive plate with velocity v at an angle of 60^\circ to the plate. Describe the subsequent motion of the electron beam.
  76. 4(c)(ii)4 marks· CAPE Physics Unit 2 · 2014 · Paper 2Compare the motion of the electrons in the electric field with that of an object in the earth's gravitational field by considering the effect of the fields on the horizontal and vertical velocity components.
  77. 4(d)5 marks· CAPE Physics Unit 2 · 2014 · Paper 2What must be the value of v if the beam is to just touch the negative plate?
  78. Q71 mark · multiple choice· CAPE Physics Unit 2 · 2015 · Paper 1What is the electric potential 25\text{ cm} from a point charge of 6 \times 10^{-8}\text{ C}?
  79. Q81 mark · multiple choice· CAPE Physics Unit 2 · 2015 · Paper 1The work done per unit charge in bringing a small positive charge from infinity to a point is the definition of
  80. Q61 mark · multiple choice· CAPE Physics Unit 2 · 2016 · Paper 1Ash from factory chimneys is trapped by the charged metal plates inside the chimney walls. The phenomenon that describes the attraction is known as
  81. Q101 mark · multiple choice· CAPE Physics Unit 2 · 2016 · Paper 1Which of the following diagrams BEST describes the path of an electron travelling through an electric field?
  82. Q71 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1What is the electric potential 25\text{ cm} from a point charge of 6 \times 10^{-8}\text{ C}?
  83. 6(c)4 marks· CAPE Physics Unit 2 · 2017 · Paper 2An oil drop of mass 3.0 × 10⁻¹⁵ kg is held stationary between two horizontal metal plates separated by 1.0 cm with an applied voltage of 350 V. Calculate the number of excess electrons on the droplet.
  84. 6(d)3 marks· CAPE Physics Unit 2 · 2017 · Paper 2When the apparatus is adjusted so that droplets rise at constant speed in air, draw and label a free-body diagram showing all the forces acting on such a droplet.
  85. Q61 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1Ash from factory chimneys is trapped by the charged metal plates inside the chimney walls. The phenomenon that describes the attraction is known as
  86. Q71 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1The SI unit of electric field strength is
  87. 4(a)(i)2 marks· CAPE Physics Unit 2 · 2018 · Paper 2Describe the conditions in the atmosphere which lead to a lightning strike and state the electrical property of the strike that makes it dangerous to natural and man-made structures.
  88. 4(a)(ii)2 marks· CAPE Physics Unit 2 · 2018 · Paper 2Define the term 'breakdown' and state ONE condition under which breakdown is likely to occur.
  89. 4(a)(iii)3 marks· CAPE Physics Unit 2 · 2018 · Paper 2Describe the functional properties of lightning rods and explain how they work to protect structures on the ground.
  90. 4(b)2 marks· CAPE Physics Unit 2 · 2018 · Paper 2On Figure 5, sketch the forces F₆ and F₁₈ on the third charge of +10 μC due to the +6 μC and the -18 μC charges respectively.
  91. 4(c)3 marks· CAPE Physics Unit 2 · 2018 · Paper 2Calculate the magnitude of EACH of the forces, F₆ and F₁₈.
  92. 4(d)3 marks· CAPE Physics Unit 2 · 2018 · Paper 2Determine a value for the NET vertical force on the +10 μC charge.
  93. Q51 mark · multiple choice· CAPE Physics Unit 2 · 2019 · Paper 1A beta particle passes a point 100\text{ nm} away from an alpha particle. What is the magnitude of the electrostatic force between the particles at that point?
  94. Q71 mark · multiple choice· CAPE Physics Unit 2 · 2019 · Paper 1What is the electric potential 25\text{ cm} from a point charge of 6 \times 10^{-8}\text{ C}?
  95. Q91 mark · multiple choice· CAPE Physics Unit 2 · 2019 · Paper 1Which of the following diagrams shows the MOST likely path a neutron will follow if projected parallel to and into the space between two charged plates?
  96. 1(a)10 marks· Physics · Unit 2 Q1 1(a)Using conventional symbols for physical quantities, complete Column 2 and Column 3 of Table 1.
  97. 1(b)5 marks· Physics · Unit 2 Q1 1(b)In the equation for Coulomb's law, F = Q₁Q₂ / (4πε₀R²), state the meaning of EACH symbol and its corresponding SI unit.
  98. 1(b)(i)3 marks· Physics · Unit 2 Q1 1(b)(i)Determine the magnitude of the electric field between the plates.
  99. 1(b)(ii)4 marks· Physics · Unit 2 Q1 1(b)(ii)Hence, calculate the vertical acceleration of the electrons as they pass between the plates.
  100. 1(c)3 marks· Physics · Unit 2 Q1 1(c)Using the formulae to calculate the electric field, E, in a parallel plate capacitor and the charge, Q, on the plates, show that E = (1/ε) * (Q/A).
  101. 1(c)4 marks· Physics · Unit 2 Q1 1(c)A +100 µC and a test charge of -5 µC are 3 mm apart. Calculate the forces between them.
  102. 1(c)(i)4 marks· Physics · Unit 2 Q1 1(c)(i)Complete Row 2 and Row 3 of Table 2.
  103. 1(c)(ii)4 marks· Physics · Unit 2 Q1 1(c)(ii)On the grid provided in Figure 2 on page 9, plot a graph of negative vertical displacement versus time for the electron motion between the plates. Draw the best smooth curve through the points.
  104. 1(c)(iii)1 mark· Physics · Unit 2 Q1 1(c)(iii)The electrons traverse the field in 3.75 nanoseconds. Use the graph in (c) (ii) to determine how far from the horizontal axis of the plates the beam will emerge, as it exits the space between the plates.
  105. 1(d)4 marks· Physics · Unit 2 Q1 1(d)Calculate the vertical velocity of the electron beam and hence its direction of travel on emerging from between the plates.
  106. 1(d)4 marks· Physics · Unit 2 Q1 1(d)Show, by equating the work per unit charge in moving a positive test charge q from B to A, that E, the strength of the uniform field between A and B, is equal to the voltage gradient.
  107. 1(d)(i)3 marks· Physics · Unit 2 Q1 1(d)(i)For those electrons which are ejected at right angles to the lower plate, calculate the MAXIMUM initial energy, in joules, they can have if none of them reach the upper plate which has a voltage of –3 V with respect to…
  108. 1(d)(ii)3 marks· Physics · Unit 2 Q1 1(d)(ii)Determine the MAXIMUM initial velocity of the electrons in (d)(i).
  109. 1(d)(iii)2 marks· Physics · Unit 2 Q1 1(d)(iii)Calculate the value of the electric field in the cloud-ground capacitor.
  110. 1(d)(iii)5 marks· Physics · Unit 2 Q1 1(d)(iii)Calculate the acceleration of the electrons in (d)(i).
  111. 1(e)(i)3 marks· Physics · Unit 2 Q1 1(e)(i)Draw a tangent to the graph in Figure 2 and measure the angle of ejection.
  112. 1(e)(ii)1 mark· Physics · Unit 2 Q1 1(e)(ii)Read off the MAXIMUM height reached from the lower plate.
  113. 1(e)(iii)1 mark· Physics · Unit 2 Q1 1(e)(iii)Read off the distance travelled parallel to the plate before being re-absorbed.
  114. 3(c)(i)1 mark· Physics · Unit 2 Q3 3(c)(i)Write the equation expressing the equilibrium between the electrical force on a charge, Q, in a field of strength, E, and the gravitational force on a droplet of mass, m.
  115. 3(c)(ii)1 mark· Physics · Unit 2 Q3 3(c)(ii)Write the equation relating the magnitude of the electric field, E, to the impressed voltage, V, and plate separation, d.

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