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Electric potential of a dipole moment

  1. Mar 10, 2013 #1
    1. The problem statement, all variables and given/known data
    The dipole moment of a water molecule is 6.29E-30Cm. What is the electric potential's magnitude 1.43nm from a water molecule along the axis of the dipole?


    2. Relevant equations
    p = qr


    3. The attempt at a solution
    I don't have values for q or r. I just know the magnitude of the dipole moment and the distance away from the molecule in which I have to figure out the electric potential. I don't know where to go from here.

    And even if given q, how would I figure out V.
     
  2. jcsd
  3. Mar 10, 2013 #2

    ehild

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    Find the electric potential of two equal and opposite charges d distance apart symbolically, at distance x from the centre of the dipole, and then take into account that x>>d.

    ehild
     
  4. Mar 10, 2013 #3
    That doesn't really help me.
     
  5. Mar 10, 2013 #4

    ehild

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    You know the formula for the potential of a point charge? A point charge q is at x1=d/2, and an other one is at x2=-d/2. What is the potential at the point with coordinate x?

    ehild
     
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