I have two electric field problems that I need help solving: 1. How strong an electric field is needed to support an electron against gravity on the surface of the earth? I know the charge of an electron is -1.60 x 10^-19C I think that you use the equation V=Ed, but I don't know what to do for the d dealing with earth. 2. What is the acceleration of a proton in an elctric field of 1 x 10^4 N/C? This one I have no idea where to start. This problem is unlike any of the others that were given. It might deal with KE, but I'm not sure. Any help would be greatly appreciated!