Coulomb's Law: The three point charges +4.0 ?C, -5.0 ?C, and -9.0 ?C are placed on the x-axis at the points x = 0 cm, x = 40 cm, and x = 120 cm, respectively. What is the x component of the electrostatic force on the -9.0 ?C charge due to the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. -0.55 N
B. 0.55 N
C. 0.64 N
D. 0.41 N
E. -0.41 N
Answer: D
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