A 16.5-m-long cable consists of asolid-inner, cylindrical, nickel core 2.0cm in diameter surrounded by a solid-outer cylindrical shell of copper 2.0 cm in inside diameter and4.0 cm in outside diameter. There sistivity of nickel is 7.8*10-8 Ω · m, and the resistivity of copper is 1.72*10-8 Ω · m.
a) What is the resistance of this cable?
b) If we think of this cable as a single material, what is itsequivalent resistivity?