The force of repulsion between two like–charged table tennis balls is 8.2 × 10-7 newtons. if the charge on the two objects is 6.7 × 10-9 coulombs each, what is the distance between the two charges? (k = 9.0 × 109 newton·meters2/coulomb2)

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)