U = k ( q1 q2 + q2 q3 + q1 q3) / r
U = 9*10^9*10^-38* ( - 1.6*1.6 - 1. 6*2*1.6 + 2* 1.6*1.6) / (2.51*10^-10)
U = - 9.179*10^-19 J
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