Question

A cylindrical metal rod is 1.00 m in length and 1.0 cm in diameter. At 20 oC the resistance
between the ends of the rod is 1.50 x 10-4 W. If one makes, out of the same material, a flat
washer that has a 2.00 cm outside diameter, a 1 cm inside diameter, and is 1.00 mm thick, what
is the resistance between the opposite faces of the disk?

Answer 1