A circular ring of radius a has a total charge Q uniformly distributed along the top half. (Q is distributed along the semicircle in...

A circular ring of radius “a” has a total charge Q uniformly distributed along the top half. (Q is distributed along the semicircle in quadrants I and II). What is the potential at a point located on the bottom of the ring (observation point is on the ring in quadrant III or IV). The location of the observation point is described as being located at an angle φ measured from the positive x axis. You want V (a, φ).