Answer:
(a) Hooke's law is obeyed up to the point P, because up to this point, stress \[\propto \] strain. (b) Point E corresponds to elastic limit because the wire returns to original state O along EPO if it is gradually unloaded. (c) The elastic region is from O to E and the plastic region is from E to B. (d) Up to point P, stress is proportional to strain. Between P and \[E\], strain increases more rapidly than stress and Hooke's law is not obeyed. When the wire is unloaded at any point A beyond E, the wire does not retrace the curve AEPO but follows the dashed curve AO?. When the stress becomes zero, a residual strain OO' is left in the wire. (e) Between C and B, the wire virtually flows out, i.e., the strain increases even when the wire is being unloaded. Fracture takes place at point B. The stress can be applied to the value corresponding to the point C without causing fracture.
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