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Homework Help: Simple three charges problem in 1D

  1. Aug 19, 2007 #1
    1. The problem statement, all variables and given/known data
    Two charges are on the X axis as follows: q1=3x10^-9 C at x=0.4metre and q2=5x10^-9 C at x=-0.2m. What is the size and direction of the sum of forces are on third charge q3=-2x10^-9 C at x=0?

    2. Relevant equations
    F=k|q1q2|/r^2

    3. The attempt at a solution
    By my calculation I achieved F(13)=3.375x10^6 N in the +x direction, and F(23)=2.247x10^6 N in the -x direction, and the sum of forces is 1.128x10^6 N to the +x direction. But the book says otherwise...
     
  2. jcsd
  3. Aug 19, 2007 #2

    Dick

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    Something is a bit off, when I compute F(13) I get a very different exponent for the force. 3.37*10^(-7) N.
     
  4. Aug 19, 2007 #3
    oh, darn
     
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