Charge on the surface of a conducting sphere.

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I need to find the charge and charge density on the surface of a conducting sphere of radius r=0.15m and of a potential of V=200V.

I know the surface charge density, which is Q/A. The surface area is 0.28274, but I can't find the charge.
 

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rl.bhat
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Potential of a spherical conductor is
V = (1/4πεο)*Q/R.
Find Q, then surface charge density.
 

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