Question
Two protons A and B are placed between two parallel plates having a potential difference V as shown in figure. Will these protons experience equal or unequal force?

Solution
Given, potential difference V is applied across two parallel plates and, two protons A and B are kept in between these plates.
Since, the electric field experienced in between the two plates is uniform throughout (same at all points, except at the edges). Therefore, both the protons A and B will experience equal forces.
Since, the electric field experienced in between the two plates is uniform throughout (same at all points, except at the edges). Therefore, both the protons A and B will experience equal forces.