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Homework Help: Potential from two charges

  1. Feb 2, 2009 #1
    1. The problem statement, all variables and given/known data
    A charge of -1.9 × 10-9 C is at the origin and a charge of 9.4 × 10-9 C is on the x-axis at x = 3 m. At what two locations on the x-axis (xpositive, xnegative) is the potential zero?
    xpositive = m
    Xpositive = .5m
    v=kq/x + (k(5Q/3-x))to solve for this value,

    xnegative = m
    I'm lost on the second part of the problem which we need to calculate the X negative
    If someone could help me set this equation up I would be very appreciative :)

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Feb 2, 2009 #2


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    Homework Helper


    How can the field be 0 on the line between a (+) and a (-) charge?
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