A) The figure below shows a total charge +Q distributed uniformly over a circular ring of radius R. The z-axis is perpendicular to the plane of the circle and passes through the center of the circle, where z = 0. What is the electric potential on the z axis? R B) You really like your new job at the atomic physics lab. Your boss casually mentions that the electron in a helium ion (He+) emits energy in the form of radiation as it jumps from an orbit that has radius of 0.42 nm to an orbit that has a radius of 0.24 nm. Sensing a chance to make a good impression, you wonder if any mpre information is needed in order to figure out the energy carried off by the emitted radiation.