Electric potential energy:
When the charge 2q is far away, the system potential is contributed by 3 charges.
rq,-3q = d
r5q,-3q = d
rq,5q = (d2 + d2)(1/2) = 2(1/2)d
Four point charges form a square with sides of length d, as shown in the figure. In the questions that follow, use the constant k in place of .
What will be the potential energy Utot of the system of charges when charge +2q is at a very large distance from the other charges?
Express your answer in terms of q, d, and appropriate constants.
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