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Homework Help: Coulomb's Law and potassium

  1. May 15, 2010 #1
    1. The problem statement, all variables and given/known data
    An electron is separated from a potassium nucleus (charge 19e) by a distance of 5.2 X 10-10m. what is the electric force between these particles? (e = 1.60 X 10-19C, Kc= 8.99 X 109 N*m2/C2)

    2. Relevant equations

    Felectric= Kc[(q1)(q2)/r2]

    3. The attempt at a solution

    Felectric= 8.99 X 109[(19e)(-1.6 X 10-19)/(5.2 X 10-10)2]

    Felectric= -1.62 X 10-8

    Is this correct?
  2. jcsd
  3. May 15, 2010 #2
    Yeah looks good, don't forget your units though.
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