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Homework Help: Electric potential between two point charges

  1. Feb 29, 2012 #1
    1. The problem statement, all variables and given/known data
    Two point charges are separated by a distance r. If the separation is reduced by a factor of 3/2, by what factor does the electric potential between them change?
    A. 3/2
    B. 2/3
    C. 9/4
    D. 4/9
    E. Sqrt(3/2)

    2. Relevant equations



    3. The attempt at a solution
    Honestly I couldn't think of any formula involving separation of 2 point charges and the electric potential between them. Reading a little more on electric potential, I find that U=Ed but then I'm not sure whether the strength of the electric field remain constant when we change the distance between two point charges.
     
  2. jcsd
  3. Feb 29, 2012 #2

    tiny-tim

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    hi drawar! :smile:
    coulomb's law? :wink:
     
  4. Feb 29, 2012 #3
    Hi there!
    I've just gone over it and still can't figure it out. Does the Coulomb's Law have anything to do with the electric potential?
     
  5. Feb 29, 2012 #4

    tiny-tim

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    indirectly …

    can't you find the potential from the field? :smile:
     
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