Three Point Charges Are Placed on the X-Axis

Multiple Choice

Three point charges are placed on the x-axis. A charge of +2.0 μC is placed at the origin, -2.0 μC to the right at x = 50 cm, and +4.0 μC at the 100 cm mark. What are the magnitude and direction of the electrostatic force which acts on the charge at the origin?

A) 0.072 N right
B) 0.072 N left
C) 0.14 N right
D) 0.14 N left
E) 0