can the feild due to a conducting cone having a charge Q  be found using gauss law? how?

step no 1. draw a gaussian surface like the given surface.

step 2. get its area

step 3. apply theorem to get E

N0W I DON'T KNOW THE AREA OF A CONE.

There must be some formula.

yes sir u r right.

indrajee_bariar,u r wrong.

it is not necessary that electric field at every point on a gaussian surface should be same.the only required condition for a gaussian surface is that the surface should be closed.

if the electric field at every point on a gaussian surface is same,then why do we take closed integral of E.dS.

if E is same ,then E should come out of integral sign in the basic gauss's theorem equation itself.( {INT(E.dS)}=q/e0 should become {E.[INT(dS)]=q/e0}

it only comes out of integral sign in special cases like cylinder,sphere etc where field is uniform.

*e0=epsilon zero.

now we know that electric field at a point just outside the conductor for is E=(e0)/(surface charge density)

if u have resnick and halliday refer the section of a charged isolated conductor in the chapter gauss law.

the derivation is given.or u can refer any good book and see abt electric field outside a charged isolated conductor in gauss law chapter.

this is valid only for a point just outside a conductor.for faraway points from the conductor,it ceases to hold true.

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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........

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