Coulomb's Law: As shown in the figure, three small charges are equally spaced on the arc of a circle that is centered at the charge Q, where Q = +23 nC and all the other quantities are accurate to two significant figures. What is the magnitude of the net electric force on the charge Q due to the other three charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2) 
A. 2.6 × 10-4 N
B. 1.7 × 10-4 N
C. 2.1 × 10-4 N
D. 3.1 × 10-4 N
Answer: A
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