given a dipole on z-axis(+q at z=a and -q at z= -a) , find out the non vanishing multipoles using spherical harmonics.(adsbygoogle = window.adsbygoogle || []).push({});

can somebody tell me how to do this problem using spherical harmonics..because when we write charge density using dirac delta function in spherical polar coordinates. then we get

phi = tan^-1 (0/0) because x and y coordinates for both the charges are zero.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Multipole expansion

**Physics Forums | Science Articles, Homework Help, Discussion**