Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Net force from charges

  1. Jun 3, 2010 #1
    If I have two different charges and I'm told to calculate net force, do I just use F=KQ1Q2/r^2 or Fnet=F1+F2...
    Please explain.
    Last edited: Jun 3, 2010
  2. jcsd
  3. Jun 3, 2010 #2


    User Avatar
    Homework Helper

    If you have two charges at a distance 'r' then it is just F=KQ1Q2/r2

    If you have more than two charges, you'd need to find the force between each pair of charges and then find the resultant force using Fnet=F1+F2
  4. Jun 4, 2010 #3
    Ahh ok thanks
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook