Question

.        A steel rod of cross-sectional area 10 mm² is subjected to loads at points P,Q,R and S as shown in the figure below:   

If E _steel = 200GPa, the total change in length of the rod due to loading is

            (a) -5 µm                     (b) – 10 µm

            (c) -20 µm                   (d) - 25µm