Physics (AS & A Level) · Oct / Nov 2021 · Paper 12 · Question 32

A proton enters the uniform electric field between two parallel vertical metal plates in a vacuum. One plate is at a potential of 0 V and the other plate is at a potential of +10 V, as shown. What is the initial change in the motion of the proton caused by the electric field, immediately after the proton enters the field?

1. AIt begins to move downwards.
2. BIt begins to move upwards.
3. CIts speed decreases.
4. DIts speed increases.

As printed in the paper