Problem 30.51 A hollow metal sphere has inner radius a, outer radius b, and cond

Question

Problem 30.51 A hollow metal sphere has inner radius a, outer radius b, and conductivity or The current I is radialyoutward from the inner surface to the outer surface. Part A 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, a, r, and appropriate constants. My Answers Give Up Correct Part B Evaluate the electric field strength at the inner surface of a copper sphere if o.7ocm and 24A Express your answer to two significant figures and include the appropriate units. E- Value Units Submit My Answers Give Up Part C Evaluate the electric field strength at the outer surface of a copper sphere if 3.0cm and 24A Express your answer to two significant figures and include the appropriate units. ES Value Units Submit My Answers Give Up

Explanation / Answer

B)

E = 24/(5.96*10^7*4*pi*(0.7*10^-2)^2) = 6.5*10^-4 V/m <----------answer

where conductivity of copper = 5.96*10^7

C)

E =  24/(5.96*10^7*4*pi*(3*10^-2)^2) =3.6*10^-5 V/m <---------answer

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