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Homework Help: Coulomb's law problem solving

  1. Sep 14, 2011 #1
    1. The problem statement, all variables and given/known data

    three objects carrying charges of (a)-4x10^-6 C, (B)-6x10^-6 C, and (c)+9x10^-6 C are placed in a line equally spaced from left to right by a distance of 0.5m. calculate the magnitude and direction of the net force acting on each.

    2. Relevant equations

    Force of the magnitude of B(-6x10^-6 C) the answer is 1.08N left
    but im getting 2.8N right

    3. The attempt at a solution

    Fba= 0.864 N (right)
    Fbc = 1.944 N (right)

    fnet = 0.864N (right) + 1.944N (right)
    = 2.8N right

    i dont understand how the book got 1.944N (left) because thats what gives 1.08(left)

    B is negative and C is positive so shouldnt B be attracted to C which is to the right?
    please help me .
  2. jcsd
  3. Sep 14, 2011 #2


    User Avatar
    Homework Helper

    As you realise, the only way to get that is if the charge on C is the same sign as the charge on B.
    Either you have mis-read, or they have mis-printed.
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