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!

Where can a third charge +Q be placed so that it experiences a zero force?

  1. Aug 1, 2012 #1
    I'm having a hard time trying to picture the problem:

    A charge of +2q is placed at the origin and a second charge of -q is placed at x= 3.0cm. Where can a third charge +Q be placed so that it experiences a zero force?

    Here is how I picture the problem:

    physics4.jpg
     
  2. jcsd
  3. Aug 1, 2012 #2

    berkeman

    User Avatar

    Staff: Mentor

    The 3rd charge could end up anywhere on the line, left, right or between the first 2 charges. What is the equation for the electric field E generated by a charge at some distance...?
     
  4. Aug 1, 2012 #3
    For Force its, F = KQQ/r2

    The way I understand the problem is it could either be on the left or right of those two charges. Because if it was in the middle, the third charge will experience a net force directed to the right. Right?
     
  5. Aug 1, 2012 #4

    berkeman

    User Avatar

    Staff: Mentor

    Yes, that is correct. It's good that you see that.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook