Three identical metal plates with large surface areas are kept parallel to each other as shown i...

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Three identical metal plates with large surface areas are kept parallel to each other as shown in figure. The leftmost plate is given a charge \( Q \), the rightmost a charge \( -2 Q \) and the middle one remains neutral. Find the charge appearing on the outer surface of the rightmost plate.
(1) \( -Q / 4 \)
(2) \( -2 Q \)
(3) \( -Q \)
(4) \( -Q / 2 \)
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