Coulomb's Law: As shown in the figure, three charges are at corners of a rectangle. The charge in the bottom right corner is Q = - 90 nC, and all the other quantities are accurate to two significant figures. What is the magnitude of the net electrical force on Q due to the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2) 
A. 3.8 × 10-2 N
B. 2.8 × 10-2 N
C. 5.3 × 10-2 N
D. 7.1 × 10-2 N
Answer: A
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