The potential energy is given by:
$$U_A = k \frac{q_1 q_3}{r_{13}} + k \frac{q_2 q_3}{r_{23}}$$
where $k = 8.99 \times 10^9 Nm^2/C^2$, $q_1 = 1.5 \times 10^{-9} C$, $q_2 = 4.0 \times 10^{-9} C$, $q_3 = 6.0 \times 10^{-9} C$, $r_{13} = L = 0.25 m$, and $r_{23} = L
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