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Homework Help: Discrete Charge problem

  1. Jan 22, 2009 #1
    1. The problem statement, all variables and given/known data
    Two point particles separated by 0.4 m carry a total charge of 185 µC.
    (a) If the two particles repel each other with a force of 80 N, what are the charges on each of the two particles?

    2. Relevant equations
    F = k* (q1*q2)/(r^2)

    3. The attempt at a solution
    I tried using altering the formula so it would be 80 = (185-x)*(x) /(.4^2). I tried putting this in my calculator in which y1 = (185-x)*(x)/(.4^2), y2= 80 yet it tells me it intersects at x = 184.9. Um what did i do wrong? I would appreciate the help :).
  2. jcsd
  3. Jan 22, 2009 #2


    User Avatar

    Two quick questions: What happened to k? and Shouldn't you do something with that micro coulombs that follows the 185?
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