Q11.26Long answer
Consider an electron in front of metallic surface at a distance d (treated as an infinite plane surface). Assume the force of attraction 1 q2 by the plate is given as 4 4πε 0d 2 Calculate work in taking the charge to an infinite distance from the plate. Taking d = 0.1nm, find the work done in electron volts. [Such a force law is not valid for d < 0.1nm].