1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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