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## Homework Statement

Find the electric potential energy for the following array of charges: charge q1 = +4.0 µC is located at (x, y) = (0.0, 0.0) m; charge q2 = +3.0 µC is located at (4.0, 3.0) m; and charge q3 = −1.0 µC is located at (0.0, 3.0) m.

_____ mJ

## Homework Equations

U=kq1q2/r12

U=kq1q3/r13

U=kq2q3/r23

## The Attempt at a Solution

Obviously, I just plug in the charges and the k constant, 8.99 x10^9, but I don't know what to put in for r. Do I have to calculate x and y components and add them up?