Question: Two positive point charges q and 4q are at x = 0 and x = L, respectively, and free to move. A third charge is

Two positive point charges q and 4q are at x = 0 and x = L, respectively, and free to move. A third charge is placed so that the entire three-charge system is in static equilibrium. What are the magnitude, sign, and x-coordinate of the third charge?

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