1.

The figure shows three identical parallel conducting plates X, Y and Z. The separation between X and Y is 2d, and that between Y and Z is d. The six surfaces of the three plates are labeled a,b,c,d,e and f, as shown. The key K_(1) can connect X to ground,and the key K_(2) can connet Z to ground. Initially, both keys are open. Y has Q charge, X and Z have no charge. If K_(1) is closed and K_(2) remains open, the charges on the surfaces a,b,c,d,e and f will be respectively.

Answer»

`0, -Q,Q,0,0` and `0`
`0,-Q//2,Q//2,Q//2` and `0`
`0,-Q//3,Q//3,2Q//3,-2Q//3` and `0`
`-Q//3,Q//3,2Q//3,-2Q//3,-Q//3` and `Q//3`

ANSWER :A


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