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Two positively charged particles, each with charge Q, are held at positions (-A, 0) and (A,...

Two positively charged particles, each with charge Q, are held at positions (-A, 0) and (A, 0) as shown in the following figure. A third positively charged particle with charge q is placed at (0, H). Find an expression for the net electric force on the third particle with charge q. Show that the two charges Q behave like a single charge 2Q located at the origin when the distance H is much greater than A.

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