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: 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.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook