3 identical charges of 2.0 uC are placed on the x-axis. The first charge is at the origin, the second to the right at x = 50cm, and the third is at the 100 cm mark. What are the magnitude and direction of the electrostatic force which acts on the charge at the origin?
F = k Q1Q2/r^2
The Attempt at a Solution
F12 = (9.0e9 * 2.0e-6 * 2.0e-6) / 1m^2 = .036N
F13 = (9.0e9 * 2.oe-6 * 2.0e-6) / 0.5m^2 = .144 N
Magnitude = .036 + .144 = .18 N
Direction = I have no clue. If they are all identical wouldn't they all repel each? Wouldn't that make the overall direction to the left since each charge repels the charge at the origin.
Thanks for the help!