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Homework Help: Net electric forces on a point charge

  1. Feb 4, 2013 #1
    1. The problem statement, all variables and given/known data
    In the figure, what is the force on charge Q3?
    Q1 = 5×10-6C, Q2 = -3×10-6C, Q3 = 4×10-6C
    http://www.usi.edu/science/physics/pickett/206/4p2f1.jpg [Broken]

    2. Relevant equations
    Coulomb's law

    3. The attempt at a solution
    I thought I could just find the charges on q1 and 3 and then on 2 and 3 and add them but I don't think that is right. Can you just add electrical forces?
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Feb 4, 2013 #2


    User Avatar

    Staff: Mentor

    Yes, use Coulomb's law and sum the 2 forces on Q3 to get the total force on Q3.
    Last edited by a moderator: May 6, 2017
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