Coulomb's Law: As shown in the figure, three charges are at the vertices of an equilateral triangle. The charge Q is 6.7 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 two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2) 
A. 2.1 × 10-3 N
B. 1.2 × 10-3 N
C. 1.0 × 10-3 N
D. 1.4 × 10-3 N
Answer: A
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