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Three charges +q,+q and Q are located at...

Three charges `+q,+q` and `Q` are located at the vertices of `a` right-angled isosceles triangle. If the total interaction energy is zero, then `Q=-{q}/{p sqrt{r}}`, Find `(p+r)`.
'(##CEN_KSR_PHY_JEE_CO19_E01_003_Q01##)'

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