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Sci Advisor
P: 1,250
 Quote by pieselsoft For a new derivation, see: http://dx.doi.org/10.1088/0143-0807/27/5/N01
That is an interesting derivation, but it is more complicated than using the magnetic scalar potential. The delta function derivation is particularly tricky as he does it.
That could have been proven more easily using spherical harmonics.