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