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Coulomb's Law in 2D Question

  1. Jul 19, 2008 #1
    1. The problem statement, all variables and given/known data

    Consider the arrangement of point charges shown below. Calculate the net force on point charge 1 given the arrangement of the point charges and the separation of the charges.

    1=2=3=e-
    2=e+
    r=0.4cm
    =0.0004m
    K=9x10^9
    Fnet=?

    Please use this link for an image of the "point charges shown below"
    http://i277.photobucket.com/albums/kk71/cobhc_27/physics101.jpg

    2. Relevant equations

    Fnet=
    Kq1q2
    r^2


    3. The attempt at a solution

    Fnet=
    Kq1q2
    ------
    r^2

    =
    kq^2
    -----
    r^2

    I assume you have to solve for 1 2 3 and 4 in this case, but I don't have a great idea on how to. From there, perhaps you add up each net force (but I don't know how to incorporate the 2d part). Any help given is greatly appreciated.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jul 19, 2008 #2
    Remember that force is a vector. To add vectors (in two-dimensions or in n-dimensions), add the components of the vector. The components can easily be calculated using trigonometric ratios, especially since you know the angle.

    Could you clear this up a bit? You have 2 twice.
     
  4. Jul 19, 2008 #3

    Fredrik

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    It's pretty easy:

    1. Calculate the force on 1 caused by 2.
    2. Calculate the force on 1 caused by 3.
    3. Calculate the force on 1 caused by 4.
    4. Add the forces together.

    Do you know how to calculate the distance between 4 and 1? Do you know how to add vectors?
     
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