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Help with Coulombs Law

  1. Jan 23, 2012 #1
    1. The problem statement, all variables and given/known data


    What is the electric force between a glass ball that has +2.8 µC of charge and a rubber ball that has -4.8 µC of charge when they are separated by a distance of 4.5 cm?


    2. Relevant equations

    F=k*Q1*Q2/r^2

    3. The attempt at a solution
    -59.6507
    -8.8888888.889
    4.4380e12
     
  2. jcsd
  3. Jan 23, 2012 #2
    i got -59.7333 but it is wrong HELP please
     
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