1. The problem statement, all variables and given/known data A uniform electric field exists in the region between two oppositely charged parallel plates 1.59 cmapart. A proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate in a time interval 1.50×10−6 s . Find the magnitude of the electric field. Use 1.60×10−19 C for the magnitude of the charge on an electron and 1.67×10−27 kg for the mass of a proton. 2. Relevant equations Coulomb: F = kQq/r2 F=ma F=qE E=kQ/r2 a=F/m 3. The attempt at a solution First I have taken this course last spring and failed it. I simply do not understand how I set up these problems and get answers without being given an example. I literally bang my head against my desk and now I am doing the exact same thing just in a new semester. So I attempted to solve the problem this way. I took E=kQ/r2 thinking that I could simly take the magnitude of Charge times Coloumbs constand divided by the distance squared. I get this E = 1.60*10-19 * 9*109 / 0.01592 to get 9*10-8 N/C. It's wrong. So I looked up a way to do this problem by Googling how to find electric field between two planes. I get E = V/d, but that is something we haven't learned yet so I think I am missing something and simply do not know where to go. How do you find electric field magnitude with the given equations? More so, how can I learn to tackle these problems since I just keep going one after the other not knowing what to do? Thanks for any and all help given!