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Homework Help: Total Electric Field

  1. Feb 11, 2009 #1
    1. The problem statement, all variables and given/known data

    A 1.8e-6 C charge is at the origin, while a -7.71e-6 C charge is 10cm to the right of it. Locate the x coordinate such that E=0. Note: q1 is at the origin O. Answer in units cm.


    2. Relevant equations

    Etot=E1+E2
    Etot=(-k*q1/x^2)+(k*q2/(0.1+x)^2)
    (k*q1/x^2)=(k*q2/(0.1+x)^2)

    3. The attempt at a solution

    I promise you I have attempted this equation. I'm not going to type it all out here. I have a sheet full of scratch work. The answer I keep getting is 1.96.
     
  2. jcsd
  3. Feb 11, 2009 #2

    Redbelly98

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    Homework Helper

    Welcome to PF :smile:

    I'm not sure where you went from here. But if you take the square root on both sides of the equation, at least you will not have to solve a quadratic.
     
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