Question

metal rod of length 10 cm and cross sectional area of 0.0002 m2 isunder tensile test. There are two loading conditions. In 1stloading condition the metal is pulled by a force of 10 N and as aresult the length of the rod changes to 11cm. In the 2nd conditionthe metal is pulled by a force of 17.5 N but due to some problemsthe change in length cannot be measured. Assume the stresses due tothe loads are in elastic region.

What are the stresses developed due to these two loadingconditions? And what is the change in length for 2nd loadingcondition?