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Electric Force magnitude and direction

  1. Sep 8, 2008 #1
    1. The problem statement, all variables and given/known data

    Three charges are arranged as shown in the picture above. Find the magnitude and direction of the electrostatic force on the 6 nC charge.

    The direction I am looking for is the angle that the resultant force makes with the positive x-axis. Do not include units for the angle and make sure you input answers for the angle in degrees.

    2. Relevant equations

    F= k(q1)(q2)/r^2

    3. The attempt at a solution

    I have that you break up the equation into F13 and F23, or so I believe.
    I say the top charge is 1 and bottom is 2.
    The F13= 2.28E-7 N
    The F23= 1.52E-7 N
    I'm stuck from this point on, I think you must use tangent function to find angle but I do not know which angles to use. Any help thank you.

    Attached Files:

  2. jcsd
  3. Sep 8, 2008 #2


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    Staff Emeritus
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    Welcome to Physics Forums trueplaya.

    Can you get the angles for F13 and F23 individually?
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