College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 26

A resistor is constructed by forming a material of resistivity 3.5 × 10 5 · m into the shape of a hollow cylinder of length 4.0 cm and inner and outer radii 0.50 cm and 1.2 cm, respectively. In use, a potential difference is applied between the ends of the cylinder, producing a current parallel to the length of the cylinder. Find the resistance of the cylinder.