(a) Compute the electrical conductivity of a
5.1-mm- (0.2-in.-) diameter cylindrical silicon
specimen 51 mm (2 in.) long in which a current
of 0.1 A passes in an axial direction. A
voltage of 12.5 V is measured across two
probes that are separated by 38 mm (1.5 in.).
(b) Compute the resistance over the entire
51 mm (2 in.) of the specimen.