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4 marksCapacitors

CAPE Physics Unit 2 · 2011 · Paper 2 · Question 4(c)(i)

A graph of ln(V/volts) against time t(s) is plotted for the discharge of the black box capacitors through the 10 M-ohm resistor.

Calculate the gradient of the graph in Figure 4 and hence determine the time constant of the circuit.

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Other parts of this question

  1. 4(a)Derive an equation for the equivalent capacitance of two capacitors connected in series.[3 marks]
  2. 4(b)A 'black box' contains a 4.7 microfarad capacitor in series with an unknown capacitor C. It was connected to a battery with emf E and discharged through a 10…[4 marks]
  3. 4(c)(ii)Calculate the value of the unknown capacitance, C.[3 marks]
  4. 4(c)(iii)Determine the value of the unknown source of emf, E.[1 mark]

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