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Homework Help: Electric Field

  1. Jan 14, 2008 #1
    I need to calculate the electric field caused by a square of wire.

    I can get the field caused by the sides of the square that are perpendicular to the x axis but I can't figure out how to get the field caused by the side parrallel to the x axis.

    here is an image of the problem.

    At the origin there is no force in the x direction but in other places there is.

    I know the the electric field = (k)q/r^2 but when I try to integrate I think I will need 3 variables.

    I'd appreciate any help.
  2. jcsd
  3. Jan 14, 2008 #2
    Uh are you sure you are not suppose to find the electric field at a given point? Also maybe placing the square wire in the x-y plane will make it simpler. Regarding needing three variables k is constant, r varies (a function of a variable ex. X), and you take a small element of charge dQ (which should have dx or whatever you choose).
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