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2 marksElectric Fields

CAPE Physics Unit 2 · 2008 (T&T) · Paper 2 · Question 6(b)(i)

Two plane parallel conducting plates 1.50 \times 10^{-2} m apart, held horizontally, with upper plate at +1.50 \times 10^3 V and lower plate earthed. An oil drop of mass 9.80 \times 10^{-15} kg remains stationary between the plates.

Draw a free body diagram showing the forces acting on the oil drop.

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Other parts of this question

  1. 6(a)(i)What is the evidence in Millikan's oil drop experiment for the quantization of charge?[2 marks]
  2. 6(a)(ii)Give TWO measures adopted by Millikan to improve accuracy in the oil drop experiment.[2 marks]
  3. 6(a)(iii)Explain how it is possible to change the charge on an oil droplet.[1 mark]
  4. 6(b)(ii)a)Calculate the charge on the oil drop.[3 marks]
  5. 6(b)(ii)b)Calculate the number of electrons attached to the oil drop.[2 marks]
  6. 6(c)The potential of the upper plate is suddenly changed to -1.50 \times 10^3 V. Determine the initial acceleration of the charged drop.[3 marks]

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