By applying an external force, a proton is moved from point
Ato point
Bin an uniform electric field of
500(V)/(m). (a) Calculate the force experienced by the proton. (b) Net external work done on the proton. (c) The potential difference between the points A and
B(\Delta V_(AB)). (d) When the external force is removed at the point
B, what is the speed of the proton when it returns to point
A?