Apoint charge with charge q1 = 3.50 μc is held stationary at the origin. a second point charge with charge q2 = -4.70 μc moves from the point ( 0.160 m , 0) to the point ( 0.290 m , 0.265 m ). how much work w is done by the electric force on the moving point charge?
express your answer in joules. use k = 8.99×109 n⋅m2/c2 for coulomb's constant: k=14πϵ0.