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A copper wire of radius a = 0.235 mm has an aluminum jacket of outer radius b = 0.302 mm. There is a current i = 1.56 A in the composite wire. Take the resistivity for copper and aluminum to be 1.69 x 10-8?·m and 2.75 x 10-8?·m. Calculate the current (in A) in (a) the copper and what is (b) If a potential difference V = 16.0 V between the ends maintains the current, what is the length in meters of the composite wire?

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