11) Three point charges of magnitudes +6.0 mC, -7.0 mC, and -13 mC are placed on the x-axis at x = 0 cm, x = 40 cm, and x = 120 cm, respectively. What is the force on the -13 mC charge due to the other two charges?
A) -0.55 N B) -0.79 N
C) 0.55 N D) 0.79 N
1 answer
not sure. .79N