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A hollow metal sphere has inner radius a, outer radius b, and conductivity σ. The current...

A hollow metal sphere has inner radius a, outer radius b, and conductivity σ. The current I is radially outward from the inner surface to the outer surface. Part APart complete Find an expression for the electric field strength inside the metal as a function of the radius r from the center. Express your answer in terms of the variables I, σ, r, and appropriate constants. E = Iσ(4πr2) Previous Answers Correct Part B Evaluate the electric field strength at the inner surface of a copper sphere if a = 1.5 cm , b = 2.5 cm , and I = 27 A . Express your answer to two significant figures and include the appropriate units. E = ; Part C Evaluate the electric field strength at the outer surface of a copper sphere if a = 1.5 cm , b = 2.5 cm , and I = 27 A . Express your answer to two significant figures and include the appropriate units. E =

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