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Coulombs law question

  1. Feb 6, 2008 #1
    1. The problem statement, all variables and given/known data
    What is the magnitude of the force a +12 µC charge exerts on a +2.7 mC charge 43 cm away?


    2. Relevant equations
    I know I have to use the equation: F=kq1q2/r^2



    3. The attempt at a solution
    F=(9*10^9)(12)(2.7)/(43^2)
    =157706868.6

    ???right???
     
  2. jcsd
  3. Feb 6, 2008 #2
    almost, attention to the unit system you are using....
     
  4. Feb 6, 2008 #3
    so i would change mC to C and cm to m...
    F=(9*10^9)(2.7*10^-6)(12*10^-6)/(.43^2)
    =1.58 N

    is this ok?
     
    Last edited: Feb 6, 2008
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