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Two positive charges q(1) and q(2) are l...

Two positive charges `q_(1)` and `q_(2)` are located at the points with redius vectors `r_(1)` and `r_(2)`. Find a negative charge `q_(s)` and a radius vector `r_(s)` of the point at which it has to be placed for the force acting on each of the three charges to be equal to zero.

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