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# Two points charges $q_1$ and $q_2$ initially at infinity, are brought one by one to points $P_1$ and $P_2$, specified by position vectors $r_1$ and $r_2$, relative to same origin. What is the potential energy of this charge configuration?

$U= \large\frac{1}{4 \pi \in _0 } \frac{q_1q_2}{|r+_1r_2|}$