Show transcribed image text Problem 5. OPTIONAL (10 points) A straight wire of radius a is made of a

Show transcribed image text Problem 5. OPTIONAL (10 points) A straight wire of radius a is made of a conducting material (Sigma = sigma1) and coated with another conducting material (sigma = sigma2). Determine the outer radius of the coated wire that carries the same amount current in the core and the coating, if the electric field is uniform in the cross section.

 

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