Alright everyone, normally im prett good with electrostatics, butlately...I've been in a serious rut. My physics professor has asked us to varify the electric field at a distance r from a cylindrical gaussian surface, under three conditions. 1) with a constant chrage density, 2) with a charge density of A/r and 3) with a charge density of Ar, where r is a variable distance and A is a constant. Now in aware that in order to get the charge within a surface, i need to integrate the density by the differential volume which is equal to r*dr*dphi*dz. This happens to be a triple integral. I even now the Gaussian law and such. The problem lies in the final algebraic remanipulation and substitution. Im getting either anomalies or nonsensical answers. Will someone show me the LIGHT!?