By applying an external force, a proton is moved from point
A
to point
B
in 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
?