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 ?C, what is the magnitude of the electrostatic force on a 30-?C charge placed at the origin?
A. 7.2 N
B. 3.9 N
C. 1.5 N
D. 14 N
E. 8.1 N
Answer: C
Physics & Space Science
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