Numerical ...

see this PDF.. this will help u.. and do let me know ur problem..

spherical coordinate system

also more questions if you have

dear plz go through the sauam series for this and also Griffiths... best regards...

refer h. anton (calculus) book, and one of the best book is ED by griffith and u may use sauam series as well

sir please send complete pic of the solution

cylindrical coordinate.

if you have griffiths of electrodynamics then see its chapter 1 it have good questions both from mathematical physics and electrodynamics

refer h. anton (calculus) book, its examples are very easy to understand and very important regarding iit jam.. practice the question of same..