Physics (AS & A Level) · Oct / Nov 2018 · Paper 12 · Question 32

Two parallel metal plates are connected to a d.c. supply, as shown. The two plates are moved towards each other at constant speed. It may be assumed that the electric field between the plates is uniform. Point P is mid-way between the two plates. Which graph shows the variation with time t of the electric field strength E at point P?

1. AGraph A: E decreasing from a maximum at t = 0, curve concave downward
2. BGraph B: E decreasing from a maximum at t = 0, curve concave upward
3. CGraph C: E increasing from zero at t = 0, curve concave downward
4. DGraph D: E increasing from a non-zero value at t = 0, curve concave upward

As printed in the paper