1. The problem statement, all variables and given/known data A ring-shaped conductor with radius a = 2.20 cm has a total positive charge Q = 0.123 nC uniformly distributed around it. (Question relevant to main problem) (a)What is the magnitude of the electric field at point P, which is on the positive x-axis at x = 35.0 cm? [**Actual Question**] A particle with a charge of - 2.70 mC is placed at the point P described in part (a). What is the magnitude of the force exerted by the particle on the ring? 2. Relevant equations F = 1/4*pi*e_o * |q| / r^2 for single point charge e_o = 8.85 * 10^-12 3. The attempt at a solution 1/(4*pi*8.85 * 10^-12) * ( 0.123*10^-9 * 2.70*10^-9 / .35^2 ) The online system says I'm off by an additive constant, I also tried 1/(4*pi*8.85 * 10^-12) * ( 0.123*10^-9 * 2.70*10^-9 / .35^2 + 0.0220^2) Since that equation was also in the book, but still no luck.