A point charge Q is placed on the x axis at x = 2.0 m. A second point charge, -Q, is placed at x = 3.0 m. If Q = 40 mC, what is the magnitude of the electrostatic force on a 30-mC charge placed at the origin?
a. 7.2 N
b. 3.9 N
c. 1.5 N
d. 14 N
e. 8.1 N
C
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