(a) A tensile stress is to be applied along the long axis of a cylindirical steel rod that has a diameter of 12 mm. Determine the magnitude of the load required to produce a 4.5x10^-3 mm change in diameter if the deformation is entirely elastic. Stainless steel poisson ratio (v) = 0.30, Elastic modulus (E) = 180 GPa (b) Explain why a material should be examined microscopically