A point charge with charge q1 is held stationary at the origin. A second point charge with charge q2 moves from the point (x1, 0) to the point (x2, y2).
How much work W is done by the electrostatic force on the moving point charge?
Express your answer in joules. Use k for Coulomb's constant (k=1/4(pi)(epsilon).
Any help will be greatly appreciated!