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Homework Help: Find an expression for the electric potential

  1. Feb 8, 2009 #1
    1. The problem statement, all variables and given/known data

    Find an expression for the electric potential a distance z away from the center of rod on the line that bisects the rod.

    Express your answer in term of k, Q, L, z and appropriate constants.

    Here is the picture.


    2. Relevant equations

    3. The attempt at a solution

    I'm thinking it should be (kQL)/z. I just can't figure out why that isn't correct.
  2. jcsd
  3. Feb 9, 2009 #2


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    Homework Helper
    Gold Member

    Hi Unger, welcome to PF!:smile:

    Why do you think it is kQL/z???.....That doesn't even have the correct units for potential!:wink:

    Instead of blindly guessing at the answer, you should try to actually calculate it!:smile:

    Hint: Use Coulomb's Law for a continuous charge distribution.
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