Question

Three identical metal plates with large surface area are kept parallel to each other. The leftmost plate is given a charge Q and the rightmost plate a charge -2Q and the middle one remains neutral. Find the charge appearing on the outer surface of the rightmost plate.

Answer 1

their are three identical plates with large surface kept parrallel to each other ,since the leftmost has a charge of =+Q so the left part of the nuetral plate will get ionized with _ Q and right side will be + Q chagred ,so the electric line of forces moves from + (positive ) side to negetive side of the rightmost plate therefore due to positive +Q charge of nuetral plate the outer part of right most plate will get ionized by +Q charge
therefore the charge on the outermost part of the rightmost plate will be +Q