1. Two 10-cm-diameter charged rings face each other, 19.0 cm apart. Both rings are charged to + 50.0 nC. What is the electric field strength at the center of the left ring? 2. E = q/(4*pi*epsilon*r2 3. Ok, the E field from the left ring is zero at this point due to cancellation/symmetry. Using r = 0.19 cm in the above equation, I obtain 1.25*104 N/C, but the correct answer is 1.13*104. What am I doing wrong?