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Homework Help: Electric Potential Problem - Fixed Template

  1. Jun 24, 2015 #1
    1. The problem statement, all variables and given/known data
    An electric charge q1 (-6e) is located at the origin. A second electric charge q2 (+2e) is located a distance "d" from the origin. In terms of "d", what is the distance "x" from q1 where the net electric potential is zero? Assume for this problem that x<d.

    2.Relevant equations
    I need a solid explanation on how to do this problem properly. I have a strong feeling that this can't be right (my attempt). I need to be able to understand and work problems like this for my upcoming exam. Any help would be appreciated.

    3. The attempt at a solution
    Vtotal = V1 + V2.
    If Vtotal = 0 then V1+V2=0.
    kq1/x = - kq2/d-x
    q1/x = - q2/d-x
    (q1(d-x))/(-q2) = x
    3(d-x) = x
    3d = 4x
    (3d/4) = x
  2. jcsd
  3. Jun 24, 2015 #2


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    Other than what appears to be a typo above, and the lack of some needed sets of parentheses, that looks good.

    I'm pretty sure that the final answer is correct.
  4. Jun 24, 2015 #3
    Thank you for your input, friend.
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