sabne resnick padha hoga

suno bhai......gauss law is gven in every era gera buk.......sabhi buk main....... and resnick haliday is a gud buk also....... ....... bhai if u remember u shud hve read ki integration of E.dS is not easy to carry in  areas where either E  is not constant or  some specialty abt it is not gven....... ab yeh poore saaf saaf likha hai wahan pe........ yeh toh yaad hoga......if nahin toh phir se padhle bhai........ E shud be const. over the gaussian surface..... or any face of it ....

aur ek baat ......... to calculate field at infinte distance....... then ats the use of takin it as a cone....... aise hi sperical point particle ho gaya

hope i m clear

in the cone E is not constant...... so dun apply it...... forget abt S .... thats after thng which is also not convinient to deal wid........

Cheers!!!!! 

Cheers!!!!!