Question

Two large, parallel, conducting plates are12 cm apart and havecharges of equal magnitude and opposite sign on their facingsurfaces. An electrostatic force of 3.3 * 10^{-15 N acts on an electron placed anywhere betweenthe two plates. (Neglect fringing.) (a) Find the electric field atthe position of the electron. (b) What is the potential differencebetween the plates?}