Aconducting sphere of radius r carries positive charge q. calculate the amount of work that would be required to move a small positive test charge q0 slowly from r=5r to r=3r. assume that the presence of q0 has no effect on how the charge q is distributed over the sphere.

express your answer in terms of the electric constant ϵ0 and some or all of the variables q, q0, and r.

w=