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Need help finding electric field!

  1. Dec 14, 2013 #1
    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!
     
  2. jcsd
  3. Dec 14, 2013 #2
    You need to look up the formula for the strength of a radial electric field (field due to a point charge). Try hyperphysics or just plain old google. You'll also need to know the charge on a proton to put into your calculation.
     
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