A -3 μC point charge and a -9 μC point charge are initially extremely far apart. How much work does it take to bring the -3 μC charge to x = 3 mm, y = 0 mm and the -9 μC charge to x = -3 mm and y = 0 mm?
a. 40 J
b. 81 J
c. 27 J
d. 6.8 J
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