1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook