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3 marksElectric Fields

CAPE Physics Unit 2 · 2005 · Paper 1 · Question 2(b)(ii)

Figure IV shows a small light-conducting sphere supported by a long fine vertical nylon thread, suspended between two large metal plates connected to a high voltage d.c. supply.

Explain why the sphere subsequently oscillates between the plates.

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Other parts of this question

  1. 2(a)(i)a)Write an expression for the electric field at B.[1 mark]
  2. 2(a)(i)b)Write an expression for the electric potential at B.[1 mark]
  3. 2(a)(ii)Show how the electric field and electric potential at B are related.[1 mark]
  4. 2(b)(i)Explain why the uncharged sphere is attracted to the positive plate.[1 mark]
  5. 2(b)(iii)When 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…[3 marks]

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