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4 Charges in a Square

  1. Mar 28, 2014 #1
    http://puu.sh/7MuKv.jpg [Broken]



    I'm not sure what equasion to apply in this situation. I'm lead to believe
    Ke((|q1||q2|) / a)
    Is what I should be applying.


    3. The attempt at a solution
    No idea thus far.
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Mar 28, 2014 #2

    Simon Bridge

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    Welcome to PF;
    What leads you to believe that is the right equation?

    Do you know the definition of the electric field?
    If you do not, look it up. (online or in your course notes or both)

    The electric field at q is the vector sum of the electric fields due to the other charges.
    Notice that the distance between Bq and q is not a.
     
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