GATE Electrical Engineering (EE) 2015 Shift 2 Solved Paper

Two semi-infinite conducting sheets are placed at right angles to each other as shown in the figure. A point charge of +Q is placed at a distance of d from both sheets. The net force on the charge is $\frac{{\mathit{Q}}^2}{4\mathit{\pi }\mathit{\epsilon }{}_0}\frac{\mathit{K}}{{\mathit{d}}^2}$, where K is given by