Question: An equilateral triangle has a point charge + q at each of the three vertices (A, B, C). Another point charge Q is placed at

An equilateral triangle has a point charge + q at each of the three vertices (A, B, C). Another point charge Q is placed at D, the midpoint of the side BC. Solve for Q if the total electric force on the charge at A due to the charges at B, C, and D is zero.

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