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Two large parallel metal plates, each ha...

Two large parallel metal plates, each having area A`, are oriented horizontally and separated by a distance `3d`. A grounded conducting wire joins them, and initially each plate carries no chatege. Now a thirdidentical plate carrying charge `Q` is inserted between the two plates, parallel to them and lacated a distance (d) from the upper plate, as shown in. What induced charge appears on each of the two original plates?
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