Equal and opposite 5 μC point charges are located at the points y = ± .5 mm ( + 5 μC at y= + .5 mm and -5 μC at y = -.5 mm) . Find the force acting on a 2 μC point charge when it is located at each of the following sites:
a) x=1mm, y = 0
b) x=0, y=1mm
c) x=0, y=-1mm