Question: An aluminum rod with a square cross section is l.3 m long and 5.2 mm on edge. (a) What is the resistance between its ends?

An aluminum rod with a square cross section is l.3 m long and 5.2 mm on edge.

(a) What is the resistance between its ends?

(b) What must be the diameter of a cylindrical copper rod of length 1.3 m if its resistance is to be the same as that of the aluminum rod?

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