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An aluminum rod with a square cross section is 2.0 m long and 6.6 mm on...

An aluminum rod with a square cross section is 2.0 m long and 6.6 mm on edge. (a) What is the resistance between its ends? (b) What must be the diameter of a cylindrical copper rod of length 2.0 m if its resistance is to be the same as that of the aluminum rod? The resistivity of aluminum is 2.75 × 10-8 Ω·m and the resistivity of copper is 1.69 × 10-8 Ω·m.

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