Three identical metal plates with large surface areas are kept parallel to each as shown in figure (30-E8). The leftmost plate is given a charge Q, the rightmost a chrge _2Q and the middle one remains neutral. Finde the charge appearing on the outer surface of the rightmost plate.

Explanation

` - Q//2, 3Q//2, -3Q//2,3Q//2,-3Q//2,-Q//2`