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Homework Help: Help figuring out Electric Potential

  1. Jan 28, 2010 #1
    1. The problem statement, all variables and given/known data
    Three charges are laid out in a Cartesian Plane:
    +q: (0,a)
    -q: (0,0)
    +q: (0,-a)

    There is some point p located on the x-axis in the positive x direction

    Show that the points where the Electric potential is 0 is x= +/- a/sqrt(3)

    2. Relevant equations

    I believe I am to use
    V = \frac{1}{4 \pi \epsilon_0} \ \frac{q}{r}\\
    because they are point charges

    3. The attempt at a solution
    I created right triangles using "P" as a point to start pythagorizing( is that a word?). Eventually I simplified it to q/(x(sqrt(a^2+x^2))
    No idea how to get it to +/- a/sqrt(3)
    Last edited: Jan 28, 2010
  2. jcsd
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