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Homework Help: Columbs Law

  1. Oct 12, 2009 #1
    1. The problem statement, all variables and given/known data

    Find the magnitude of the force b/w charges

    (1,2,3) (5,-2,4)

    () ()
    5 micro Columb 6 micro columb
    charge 1 charge 2

    3. The attempt at a solution



    Vector r = (5-1)i + (-2-2)j + (4-3)k
    Vector r = 4i -4j + k

    Magnitude of Vector r = Square root (4^2 + (-4)^2 + 1^2)

    Magnitude of Vector r = square root (33) or 5.744


    a/c to columbs law

    F= (9x10^9) (5x10^-6 ) (6x10^ -6 ) (4i-4j+k)
    5.744 ^3 (cube b/c unit vector )

    F= 0.27 { what should i do of ( 4i-4j+k )
    5.744^3


    what should i do please i hve got paper on WeDnesday Help me
     
  2. jcsd
  3. Oct 12, 2009 #2

    rl.bhat

    User Avatar
    Homework Helper

    Hi wizard.ubit, welcome to PF.
    In the problem only magnitude is required.
    So F = k*q1*q2/d^2
     
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