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Electric Force/ Electrical Fields

  1. Feb 6, 2009 #1
    1. The problem statement, all variables and given/known data

    Two point charges are separated by a distance r and repel each other with a force F. If
    their separation is reduced to 0.293 times the original value, what is the magnitude of
    the force of repulsion between them?

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Feb 6, 2009 #2

    LowlyPion

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    What would your approach be here?
     
  4. Feb 7, 2009 #3
    0.293 + r+F= r+ 0.293???
     
  5. Feb 7, 2009 #4

    LowlyPion

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    Based on what formula?
     
  6. Feb 7, 2009 #5
    F= Keq/r sqed
     
  7. Feb 7, 2009 #6

    LowlyPion

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    So F = k*qq/r2

    They want you to use .293*r instead or r

    What effect does that have on F?
     
  8. Feb 7, 2009 #7
    F is consider the electric field force
     
  9. Feb 7, 2009 #8

    LowlyPion

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    Yes.

    So what's the answer?
     
  10. Feb 7, 2009 #9
    F = k*qq/r2 F= 8.99x 10^9 * (1.6x 10 ^-19 ) sqed divide by .293 = 2.68x 10^ -27,
     
    Last edited: Feb 7, 2009
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