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3 marksCapacitors

CAPE Physics Unit 2 · 2017 · Paper 2 · Question 1(e)

Calculate the capacitance of a parallel-plate capacitor constructed from two circular metal plates of radius 15 cm separated by 1.0 mm of dielectric material with dielectric constant 10.

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Other parts of this question

  1. 1(a)Complete Columns 3 and 4 in Table 1 by calculating 1/d in mm⁻¹ and 1/d in m⁻¹.[2 marks]
  2. 1(b)Use the results in Table 1 to plot a graph of capacitance, C (nF), versus 1/d (m⁻¹) on the grid provided in Figure 1, and draw the line of best fit.[4 marks]
  3. 1(c)(i)A capacitor of capacitance 10 nF is constructed using the same materials. Determine from the graph the dielectric thickness required for this 10 nF capacitor.[2 marks]
  4. 1(c)(ii)Sketch a graph showing the voltage charging characteristic when the 10 nF capacitor is charged to 200 V.[2 marks]
  5. 1(d)(i)State the formula used to calculate the capacitance of a parallel plate capacitor of area A and plate separation d with dielectric constant k.[1 mark]
  6. 1(d)(ii)State another term for the dielectric constant, k.[1 mark]

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