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Coloumbs Law & Charges. Please help!

  1. Feb 14, 2012 #1
    Coloumbs Law & Charges. Please help! :(

    1. The problem statement, all variables and given/known data

    A charge of +2.0 nC and a charge of +8.0 nC are separated by 36.0 cm. Find the equilibrium position for a −2.0 nC charge as a distance from the first charge. Answer in units of cm


    2. Relevant equations

    q/r^2

    3. The attempt at a solution

    I really have no idea how to even start. We just started learning about charged in physics and our teacher hasn't taught us a whole lot (yet we still have to do this homework by ourselves). I just need to understand how to do these problems, and any help would be more than appreciated. Thank you so much and I apologize for not having more information to give!
     
  2. jcsd
  3. Feb 14, 2012 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    hi charliexx09! :wink:
    call the distance from the first charge "x"

    use your formula to find the strength and direction of the forces from each charge

    then for what value of x are those two forces equal and opposite? :smile:
     
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