CAPE Physics Unit 2 · 2015 · Paper 1 · Question Q9

Diagram 1 shows a parallel plate capacitor with the space in between the plates filled with air. Diagram 2 shows the same capacitor with the space in between the plates filled with a dielectric whose permittivity is twice that of air. What is the ratio of C_2 : C_1?

1. (A)1 : 1
2. (B)\frac{3}{2} : 1
3. (C)\frac{1}{3} : 1
4. (D)2 : 1

This question uses a figure or table from the paper — you'll see it when you practise.