Three metallic plates out of which the middle is given charge \( Q \) as shown in the figure. Th...

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Three metallic plates out of which the middle is given charge \( Q \) as shown in the figure. The outer plates can be earthed with the help of switches \( S_{1} \) and \( S_{2} \). The area of each plates is the same. Answer the following question based on the given passage.
The charge that will flow to the earth through \( S_{2} \) when both the switches \( S_{1} \) and \( S_{2} \) are grounded simultaneously is
(1) \( Q \)
(2) \( -Q \)
(3) \( 3 Q / 4 \)
(4) \( Q / 4 \)
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