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Capacitance (A-level only)

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Question 45

An electrostatic experiment uses an air-filled parallel-plate capacitor with plate separation ddd. The capacitor is fully charged using a power supply until the electric field strength between the plates is EEE. The capacitor is then completely disconnected and isolated from the power supply.

The plate separation is then increased to 3d3d3d, and a sheet of nylon with a relative permittivity (dielectric constant) of εr=5.0\varepsilon_r = 5.0εr​=5.0 is inserted, completely filling the volume between the plates.

What is the new electric field strength between the plates in terms of EEE?

A

5E3\frac{5E}{3}35E​

B

3E5\frac{3E}{5}53E​

C

E5\frac{E}{5}5E​

D

E15\frac{E}{15}15E​

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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