Two large, parallel, conducting plates are 18 cm apart and have charges of equal magnitude and opposite sign on their facing surfaces. An electrostatic force of 4.1x10-15 Nacts on an electron placed anywhere among the two plates.(Neglect fringing.) (a) Discover the electric field (in N/C) at the position of the electron. (b) What is the potential dissimilarity in volts among the plates?