I have two questions! General: A uniform circular ring of charge Q and radius R is located in the x-y plane, centered on the origin as shown in the figure. #1 What is the magnitude of the electric field, E, at point P located a distance z above the center ring? I came up with kQ/(R^2 + z^2). I would like to know if this is correct or where I went wrong, and how to disprove other answers! #2 What is the voltage at location P, assuming the voltage at infinity is zero? Any help is appreciated! Thanks in advanced!