A 6.00-mC charge is placed at the origin and a second charge is placed on the x axis at x = 0.300 m. If the resulting force on the second charge is 6.40 N in the negative x direction, what is the force on the charge at the origin?
a. 6.40 N in the negative x direction
b. 0 N
c. 6.40 N in the positive x direction
d. not able to be determined until the second charge is known
C
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