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Homework Help: Electric Field due to a Dipole

  1. Feb 18, 2008 #1
    [SOLVED] Electric Field due to a Dipole

    1. The problem statement, all variables and given/known data
    The figure shows two charged particles on an x axis: -q=[itex]-3.20(10^{-19})C[/itex] and q=q=[itex]3.20(10^{-19})C[/itex]. They are both a horizontal distance of 3 m from the y axis. What are the magnitude and direction of the net electric field produced at P at y=4 m?


    Okay. So I know I can use the Dipole equation for this, but I had originally tried placing a test charge at P and adding the fields component wise.

    I got the wrong answer and I was just wondering why you cannot take this approach?

    This is what I had tried:
    [tex]E_{px}=\sum E_x=k[\frac{-|q_1|-|q_2|}{d^2}](\frac{3}{5})=-3.836(10^{-10})[/tex]

    [tex]E_{py}=\sum E_y=k[\frac{-|q_1|+|q_2|}{d^2}](\frac{4}{5})=0[/tex]
  2. jcsd
  3. Feb 18, 2008 #2
    Nevermind. This works! I was using the wrong d!!
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