Two infinitely large charged planes having uniform surface charge density +σ and -σ are placed along x-y plane and y-z plane, respectively, as shown in the figure. Then the nature of electric lines of forces in x-z plane is given by

The electric field intensity due to each uniformly charged infinite plane is uniform. The electric field intensity at points A, B, C andD due to plane 1, plane 2 and both planes are given by E1, E2 and E as shown in figure l . Hence, the electric lines of forces are as given in figure 2.