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Homework Help: Electric Field Homework

  1. Jun 30, 2009 #1
    1. The problem statement, all variables and given/known data
    Here it goes.
    2 pontual charges (Q>0), placed in (0,a,0) and (0,-a,0): calculate de vector E(x,0,0) along xx

    2. Relevant equations

    3. The attempt at a solution
    I tried to use E=1/(4*pi*epsilon naught) * Q/r2
    but when i make Q/(x ex + a ey)2 and (x ex + (-a) ey)2
    i don't know what to do...
    (I think i have doing something wrong)
    Last edited: Jun 30, 2009
  2. jcsd
  3. Jun 30, 2009 #2


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    Homework Helper

    but when i make Q/(x ex + a ey)2 and (x ex + (-a) ey)2
    This step is not clear.
    Here r^2 = x^2 + a^2.
    Here E has the same magnitude but different direction. Take its components along X and y axis and then take the resultant.
  4. Jun 30, 2009 #3
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