Potential Energy: How much energy is necessary to place three +2.0-µC point charges at the vertices of an equilateral triangle of side 2.0 cm if they started out extremely far away? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 4.5 J
B. 5.4 J
C. 6.7 J
D. 7.6 J
Answer: B
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Fill in the blank(s) with the appropriate word(s).