5.6. You have three copper wires. Two have the same cross-sectional radius, but one is twice as long as the other. The third is twice the diameter of the other two and is equal in length to the longer of the other two. (a) Rank the wires from least resistance to most resistance. (b) Calculate the resistance of the shortest wire if it is 20 m long and has a radius of 0.91 mm. (The conductivity of copper is 5.9 × 107 A/V m or 5.9 × 107 (m) -¹.)

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