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find the electric field of a distance z from the center of a spherical surface of radius r, which carries a uniform charge density sigma. treat the case z<r(inside the sphere) as well as z>r(outside of the sphere)> Express your answer in terms of the total charge Q on the sphere. (suggestion: use the law of cosines to write ro in terms of r and theta. be sure to take the positive sq rt) (also keep in mind that in spherical coordinates, unit vectors have nonzero derivatives)

thanks in advance