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Homework Help: Electric field and two charges

  1. Feb 16, 2010 #1
    1. The problem statement, all variables and given/known data

    Two charges –Q0 and -3Q0 are a distance l apart. These two charges are free to move but do not because there is a third charge nearby. What must be the charge and placement of the third charge for the first two to be in equilibrium?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Feb 16, 2010 #2
    Condition for equilibrium: no net force acting on each charge.
    Apply this condition to each of the two charges to obtain a unique solution.

    If you still have any problems, we'll further discuss them when you've attempted the problem.
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