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Capacitance (A-level only)

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Question 29

A physicist is designing two different parallel-plate capacitors for a tuning circuit.

The first capacitor has circular plates of radius r r\,r separated by a distance 2d2d2d, and the gap between the plates is completely filled with a ceramic dielectric of relative permittivity ϵr\epsilon_rϵr​.

The second capacitor has circular plates of radius 3r 3r\,3r separated by a distance ddd, and the gap is completely filled with a liquid dielectric of relative permittivity 2.0.

Both capacitors have the same capacitance. What is the relative permittivity ϵr \epsilon_r\,ϵr​ of the ceramic dielectric in the first capacitor?

A

9.09.09.0

B

121212

C

181818

D

363636

Markscheme

Capacitance (A-level only) Questions

  1. A Level
  2. /Physics
  3. /Capacitance (A-level only)

63 exam-style questions on AQA A Level Physics Capacitance (A-level only), covering Capacitance (A-level only), Parallel plate capacitor (A-level only), Energy stored by a capacitor (A-level only), and Capacitor charge and discharge (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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