Question: Two positive charges ql and q2 are located at the points with radius vectors r1 and r2. Find a negative charge q3 and a radius

Two positive charges ql and q2 are located at the points with radius vectors r1 and r2. Find a negative charge q3 and a radius vector r3 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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