Physics - Old Questions

8. Two large parallel plates are separated by a distance of 5 cm. The plates have equal opposite charges that create an electric field in the region between plates. An a particle(q = 3.2x10^-19C, m = 6.68x10^-27kg) is released from the positively charged plate, and it strikes the negatively charged plate 2 x 10^-6 sec later. Assuming that the electric field between the plates is uniform and perpendicular to the plates, what is the strength of the electric field?[5]