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Homework Help: Starting from the equations for a dipole oriented along z, show that the field

  1. Oct 29, 2011 #1
    1. The problem statement, all variables and given/known data

    Starting from the equations for a dipole oriented along z, show that the field of a perfect dipole can be written as:

    E=[1/(4pi epsilon0 r^3)] [3(p.r-hat)r-hat -p]

    3. The attempt at a solution
    V(r)= (p.r-hat)/(4pi epsilon0 r^2)

    E=-grad V
    =-[3p. r-hat]/[4 pi epsilon0 r^3]
     
  2. jcsd
  3. Oct 29, 2011 #2
    Are you so sure about the grad part?And by the way are you familiar with multipole expansion?
     
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