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Homework Help: Electric Field Problem

  1. Feb 20, 2016 #1
    1. The problem statement, all variables and given/known data
    Three charges q1=+2Q q2=-2Q q3=-4Q. are each a distance d from the origin. What is the magnitude and direction of the electric field at the origin.

    I'm getting confused by not having d specified as a number.

    2. Relevant equations
    E = Σ kq/r2

    3. The attempt at a solution
    I've determined the magnitudes of the three E vectors for each charge. I know I cannot algebraically sum them and that I have to use sin/cos to get their components however I dont know where to begin.
    Thank you so much for your help!!
  2. jcsd
  3. Feb 21, 2016 #2


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    Homework Helper
    Gold Member

    Calculate the components along x and y axes. You know the angle already. Add them according to vector addition rule to get the resultant electric field.
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