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Question: Two equal point charges of magnitude 4.0 µC are situated along the x-axis at x1 = -2.0 m and x2 = -2.0 m. What is the electric potential energy of this system of charges?
A) 72 mJ
B) -72 mJ
C) 0 J
D) 36 mJ
E) -36 mJ
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