A uranium ion and an iron ion are separated by a distance of R = 29.90 nm, as shown in the figure. The uranium atom is singly ionized; the iron atom is doubly ionized. Calculate the distance r from the uranium atom at which an electron will be in equilibrium. Ignore the gravitational attraction between the particles. r = What is the magnitude Fu of the force on the electron from the uranium ion? uranium ion electron Kr K 12.38 R iron ion ++ nm N Fu =