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Two parallel metallic plates, each of area A are kept as shown in the figure and charges -2Q and 4Q are given to them. Edge effects are negligible. The charges on the surfaces I and III are respectively

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+2Q, -3Q

-Q, +3Q

+Q, +3Q

-2Q, +2Q

answer is C.

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Detailed Solution

$Q_{1} = Q_{I V} = \frac{q_{1} + q_{2}}{2}$

$Q_{∥} = \frac{q_{1} - q_{2}}{2} = - Q_{III}$

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