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Coulomb's Law

  1. Mar 15, 2009 #1
    1. The problem statement, all variables and given/known data
    I'm given a chart of Force vs Seperation with the following values:

    SEPARATION (m)
    0.1
    0.2
    0.3
    0.4
    0.5
    0.6

    FORCE (N)

    0.79
    0.48
    0.20
    0.05
    0.022

    Where FORCE is the y-axis, and 0.1 corresponds with 0.79.

    I am not given any other values. All I know is that these are measures of distance and forces between two identical, equally charged spheres.

    Now I am tol to manipulate the data until I get a set of values that will form a straight line when graphed.





    2. Relevant equations

    E = kq1q2/r^2




    3. The attempt at a solution

    I know that Coulomb's law works out to k x q1 x q2 x 1/r^2
    So if I were to multiply by r instead of 1/r^2 I should get a linear graph...

    Problem is, I don't have any values for either charge.

    I'm totally stumped. Can someone point me in the right direction?
     
  2. jcsd
  3. Mar 15, 2009 #2
    CORRECTION: The charges are not equally charged. Apparently A has a charge of 3.08 x 10^-7. I am not given the charge of B.
     
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