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Physics
Physics
Problem
A square of side length
a
a
a
has point charges
+
q
+q
+
q
at two adjacent corners and
−
q
-q
−
q
at the other two adjacent corners. Determine the total electric potential energy of this system. a)
−
2
k
q
2
a
\displaystyle -\frac{2kq^{2}}{a}
−
a
2
k
q
2
b) 0 c)
−
2
k
q
2
a
\displaystyle -\frac{\sqrt{2}\,kq^{2}}{a}
−
a
2
k
q
2
d)
2
k
q
2
a
\displaystyle \frac{\sqrt{2}\,kq^{2}}{a}
a
2
k
q
2
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