Electric Potential Energy of a Charge System
Four identical charges $$q$$ are positioned at the corners of a square with side length $$d$$. The electric potential energy of a pair of charges separated by a distance $$r$$ is given by $$kq^2/r$$. What is the total electric potential energy of this system of charges?
A
$$4kq²/d$$
B
$$2kq²/d + 2√2kq²/d$$
C
$$6kq²/d$$
D
$$4kq²/d + 2kq²/(d\sqrt{2})$$
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