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 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


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Welcome to Physics Forums trueplaya.

    Can you get the angles for F13 and F23 individually?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook