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Figure shown an arrangement of three points charges. The total potential energy of this arrangement zero. The ratio `(q)/(Q)` is :

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`U_("sys")=1/(4pi epsi_(0)) [(-qQ)/r+((+q)(+q))/(2r)+(Q(-q))/r]=0`
`-Q+q/2-Q=0` or `2Q=q/2` or `q/Q=4/1`.
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