View Policies Current Attempt in Progress An aluminum rod with a square cross section is 2.7 m long and 5.5 mm on edge. (a) What is the resistance between its ends? (b) What must be the diameter of a cylindrical copper rod of length 2.7 m if its resistance is to be the same as that of the aluminum rod? The resistivity of aluminum is 2.75 x 10-8 Q.m and the resistivity of copper is 1.69 x 10-8 0.m. (a) Number i Units C (b) Number i Units C