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Gauss' law

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A hollow, conducting sphere with an outer radius of 0.242m and an inner radius of 0.197m has a uniform surface charge density of 6.68*10^-6 C/m^2. A charge of -0.830 microC is now introduced into the cavity inside the sphere.

A) What is the new charge density on the outside of the sphere in C/m^2?
B) What is the strength of the electric field just outside the sphere in N/C?
C) What is the electric flux through a spherical surface just inside the inner surface of the sphere in N*m^2/C?

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