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Homework Help: Electric Field and two point particles

  1. Jan 25, 2009 #1
    1. The problem statement, all variables and given/known data
    Two point particles separated by 0.4 m carry a total charge of 185 µC.
    (a) If the two particles repel each other with a force of 80 N, what are the charges on each of the two particles?
    q2=176 µC
    *I know they dont add up to 185 but it took both of the answers as correct*
    (b) If the two particles attract each other with a force of 80 N, what are the charges on the two particles?

    I don't see why it wouldn't be the same answer except one of them would be negative.
    According to F=k*[tex]\frac{|q_{1}*q_{2}|}{r^{2}}[/tex]The type of charge doesn't matter when calculating force.
  2. jcsd
  3. Jan 25, 2009 #2


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    Homework Helper

    The product of the signs determine direction, as you observed.
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