1. The problem statement, all variables and given/known data What is the electric field at a distance of 0.4 nm from a nitrogen nucleus containing 7 protons and 7 neutrons? 2. Relevant equations I got the answer 6.3E10 but I do not remember how I got to that answer and now I need to do this same problem but at a distance of .2 nm instead of .4 nm! Any help would be nice! 3. The attempt at a solution Thanks!