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Homework Help: Magnitude and direction of Couloumb force.

  1. Sep 4, 2010 #1


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    1. The problem statement, all variables and given/known data
    Calculate the magnitude and direction of the Coulomb force on each of the three charges shown in the figure below.

    a) 6.00 microcoloumbs
    b)1.50 microcouloumbs
    c)-2.00 microcouloumbs

    2. Relevant equations

    F = Ke*|q1||q2|/(r)^2

    3. The attempt at a solution

    a) 6*10^-6 * (1.50^-6)/(.03)^2 * 8.99^10^(-9) = 90, with direction to the right.
    b) 1.50*10^(-6) * -2.00*10^(-6) * 8.99 * 10^(9) = -67.425 + 90 = 22.58, with direction towards the right.
    c) The answer is just -67.425, towards the left.

    Is this correctly done? If not, can anyone explain what I did wrong and tell me correct method plz? Diagram below for reference.

    Attached Files:

  2. jcsd
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