Three identical metallic plates are kept parallel to one another at separations \( a \) and \( b...

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Three identical metallic plates are kept parallel to one another at separations \( a \) and \( b \). The outer plates are connected to the ground and the middle plate is given charge \( Q \) (figure). Then, the charge on the right side of middle plate is
(1) \( Q / 2 \)
(2) \( -\frac{Q b}{a+b} \)
(3) \( \frac{Q b}{a+b} \)
(4) \( \frac{Q a}{a+b} \)
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