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Math Help - Electrostatic forces - resultant force & unit vector

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    Junior Member froodles01's Avatar
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    Post 3 pt charges - resultant force & unit vector

    This is straightforward, really, but . . . .
    3 charges,
    A at point (0,0) (charge +Q),
    B at point (-a, a) (charge -3Q) &
    C at point (a,a) (charge +Q)

    I have found the magnitude of the force acting on C due to the other charges (((sqrt 2)/4,∏ E0) * Q^2/a^")
    but need to find the unit vector which specifies it's direction.

    I need to find the displacement vectors for each of these other points B & C.
    Last edited by froodles01; April 16th 2012 at 12:48 PM.
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