Four identical conducting balls are attached to insulating supports that sit on the floor as shown below.

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Four identical conducting balls are attached to insulating supports that sit on the floor as shown below. One ball has charge Q; its support is fixed in space. The other three balls are uncharged but their supports can be moved around. Describe a procedure (that involves only moving and/or bringing balls into contact) that will leave the +Q ball with its full charge and give the three originally uncharged balls charges q, −q/2, and −q/2. You may assume that q < Q.

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