1. The problem statement, all variables and given/known data Assume a uniformly charged ring of radius R and charge Q produces an electric field Ering at a point P on its axis, at distance x away from the center of the ring. Now the charge Q is spread uniformly over the circular area the ring encloses, forming a flat disk of charge with the same radius. How does the field Edisk produced by the disk at P compare to the field produced buy the ring at the same point? (a) Edisk < Ering (b) Edisk = Ering (c) Edisk > Ering (d) impossible 2. Relevant equations 3. The attempt at a solution I'd say the answer is Ering > Edisk based on my logical perception ... can anyone tell me if this is true?