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Differentiating modulus in electrostatic potential

  • Thread starter kryky
  • Start date
  • #1
1
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Hi,

I am trying to do the multipole expansion of a point charge away from the origin, I can't understand Legendre polynomials so want to do it in Cartesian but when I try to Taylor expand
the [tex]\left|\frac{1}{\vec{r}-\vec{r'}}\right|[/tex] I am not sure how to handle the modulus.

Any help appreciated.
 

Answers and Replies

  • #2
122
0
Griffith's Classical electrodynamics p.147 has a detailed explanation for multipole expansion. You may take a look on the that book.
 

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