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Homework Help: Electric Potential From Electric Field

  1. Oct 1, 2009 #1
    1. The problem statement, all variables and given/known data
    Two particles, of charges q1 and q2 are separated by distance d. The net electric field due to the particles is zero @ x=d/4.
    With V=0 @ infinity, locate (in terms of d) any point on the x axis (other than infinity) at which the electric potential due to the two particles is zero.

    2. Relevant equations
    V=-[tex]\int[/tex][tex]^{f}_{i}[/tex] ([tex]\vec{E}[/tex] [tex]\bullet[/tex] d[tex]\vec{s}[/tex])

    3. The attempt at a solution
    Seems too obvious to be true, but I think V = 0 @ d/4 since E=0 as well.
    Anyone see where else is could be?
  2. jcsd
  3. Oct 1, 2009 #2
    Pretend like the two particles are equidistant from the origin, therefore the origin is the middle of the two charges. When finding potential at a point, it is the potential of one charge on the point plus the potential of the other charge on the point. Potential is not a vector, so I believe if the charges are the same, you will find your answer in the middle of the two charges.
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