1. Not finding help here? Sign up for a free 30min 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!

Need help with Columb law question.

  1. Aug 24, 2006 #1
    I belive this is the right place for this question. I am strugling with getting this homework problem setup. The question is:

    A charge q1 = -3 nc is placed at the origin of an xy-cordinate system, and a charge q2=2.00nC is placed on the positive y Axis at y=4cm. If a third charge q3 =4nC is now placed at point x=3 cm, y=4cm, find the x and y componets of the total force exerted on this charge by the other two.

    I have setup my grid and figured out the force on the y Axis is -3.45 X 10^-5 (or at least I hope that is correct) but I am having problems figuring out how to setup the problem to get the force on the x axis. If I didn't calculate the force right for the y axis please let me know. I have been using coulombs law of f=k(q1q2/r^2)
  2. jcsd
  3. Aug 24, 2006 #2

    Andrew Mason

    User Avatar
    Science Advisor
    Homework Helper

    Your answer for the force on the y axis is correct, in Newtons. The force in the +x direction is the force between charge 2 and 3 less the x component of the force between 1 and 3 (which is in the - x direction). I get about 5.4 x 10-5 N. in the + x direction.

  4. Aug 25, 2006 #3
    thank you for the help.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Need help with Columb law question.
  1. Columb's law (Replies: 5)

  2. Columbs Law (Replies: 1)