College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 4

A Van de Graaffgenerator is charged so that a proton at its surface accelerates radially outward at 1.52 × 10 12 m/s 2. Find (a) the magnitude of the electric force on the proton at that instant and (b) the magnitude and direction of the electric field at the surface of the generator.