How to Derive the Electric Field Outside a Charged Spherical Conductor?

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Foxx
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What is your question? You basically would have, i believe, two types of questions related to electric field and a sphere. When the charge is all on the surface of a sphere or when it is uniformly distributed. Usually Gauss law is used in both cases, basically you youse this law for all gaussian surfaces, because it takes advantage of symmetrical shapes, such as a sphere in this case.
 
txs, for replying stupidmath. My question is if the electric potential inside a charged spherical conductor of radius R is given by V = keQ/R, and the potential outside is given by V = keQ/r. Using Er = -dV/dr, how would I derive the electric field outside this charge distribution?