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.

Options

A. `(Q)/(2)`
B. `(Q)/(3)`
C. `-(Q)/(2)`
D. `-(Q)/(4)`

Answer

3

Explanation

The charge on outer surfaces of extreme plates = total charge//2 `= (Q - 2Q)/(2) = -(Q)/(2)`