Two very large thin conducting plates having same cross-sectional area are placed as shown in figure. They are carrying charges Q and 3Q respectively. The variation of electric field as a function at x(for x = 0 to x = 3d) will be best represented by - Q 3Q Y (d,0) (2d,0) (3d,0) E (A) () d 2d 3d - d 2d 3d x E E 1 2d 3d 3d x (C) 2d (D)