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A charge Q located at a pointr is |r| i...

A charge Q located at a pointr is |r| in equilibrium under the combined electric field of three charges `q_(1),q_(2),q_(3)` . If the charges `q_(1),q_(2)` are located at points `r_(1)` and `r_(2)` tespectively, find the direction of the force on Q, due to `q_(3)` in terms of `q_(1),q_(2),r_(1), r_(2)` and r.

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See the page 3. (Principle of Superposition of Electrostatic Forces).
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