Ran into a question in my amateur research. Been waaay too long since college physics, and I've exhausted searches. This is the theoretical question: Assume a non-conducting, infinite plane charged to +10 kV. An electron leaves perpendicular to the surface with an energy of 10 keV. How far does the electron travel before it is brought to a stop by the attraction to the charged plane? Trying to figure out (at least theoretically), if my electrons are smacking into the chamber walls. Would like to be able to calculate the distance for any voltages used. Closest thing I've found is this: Question 5 http://www.phys.ufl.edu/~acosta/phy2061/Exams/Exam1_soln_f06.pdf Very close to what I need, except they use charge density on the plane; I only know the floating voltage of the plane. I think I almost have it, but I don't seem to be able to convert voltage (V) to charge density or electric field (E) in the equations. Thanks for any help.