1975E1. Two stationary point charges +q are located on the y-axis as shown above. A third charge +q is brought in from infinity along the x -axis.
a. Express the potential energy of the movable charge as a function of its position on the x -axis.
b. Determine the magnitude and direction of the force acting on the movable charge when it is located at the position x=l
c. Determine the work done by the electric field as the charge moves from infinity to the origin.