Ncert Exercises & Solutions

Consider an electron in front of the metallic surface at a distance d (treated as an infinite plane surface). Assume the force of attraction by the plate is given as $\frac{1}{4} \frac{q^{2}}{4 π ε_{0} d^{2}}$ . Calculate work in taking the charge to an infinite distance from the plate. Taking d=0.1 nm, find the work done in electron volts. [Such a force law is not valid for d < 0.1nm]