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Homework Help: Force on particle: Coulomb

  1. Sep 24, 2012 #1
    1. The problem statement, all variables and given/known data
    I have a simple question about forces on separated particles, but still need a bit of help. I have put down what I can:

    3 particles;
    A on y-axis @ √3, charge "q"
    B & C each on x-axis, symmetrical about origin, separated by 2a, both charge "q".

    Find magnitude & direction of force acting on A due to B & C.

    2. Relevant equations
    Coulombs law FAB[/SUB] = (q1 q2)/4∏ε0rAB rAB hat
    All force should be attractive so
    Resultant force on A should be 2x force from either A or B? Yes?
    So should now become
    FAB = (2 q2)/4∏ε0rAB rAB hat

    r, from trig ratios, should be . . . . er . . . . √(a2+3) . . . . . feeling foolish here please help

    Then F[/SUB] AB = 2q2 / ∏ε0√(a^2+3)
    Last edited: Sep 24, 2012
  2. jcsd
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