1. The problem statement, all variables and given/known data 2.75 mC is uniformly distributed on a ring of radius 8.5 cm. Find the electric field on the axis at (a) 1.2 cm, (b) 3.6 cm and (c) 4.0 m from the center of the ring. 2. Relevant equations E = (kQx)/(a^2+x^2)^(3/2) 3. The attempt at a solution This question really boils down to a calculator issue, operator error issue or the abyss of unknown. When I perform the calculation on two different calculators using different methods, including a graphing calculator that has memory allowing me to repeat an equation previously used and change its variables, I get a strange answer for the second part 3.6cm. It ends up larger by one order! It can't be because its further from the charge, but each time I calculate it I get an erroneous value. a) 4.695 x 10^5 N/C b) 1.13 x 10^6 N/C c) 1.54 x 10^3 N/C Please don't say throw out the calculator because I checked it with a 30 year old Sharp 531D and I get the same results!! I must be missing something. Anyone able to assist? Most appreciated, thanks!