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A copper wire of radius a = 0.161 mm has an aluminum jacket of outer radius b = 0.218 mm. There is a current i = 1.58 A in the composite wire. Take the resistivity for copper and aluminum to be 1.69 x 10-80.m and 2.75 x 10-80.m. Calculate the current in (a) the copper and (b) the aluminum. (c) If a potential difference V= 11.8 V between the ends maintains the current, what is the length in meters of the composite wire