(Answered) A long round wire of radius a and conductivity sigma is

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A long round wire of radius a and conductivity σ is coated with a material of conductivity 0.1σ. (a) What must be the thickness of the coating so that the resistance per unit length of the uncoated wire is reduced by 50%?

Why R1 must be equal to R2 so that the resistance of the uncoated wire is reduced by 50%?

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