The correct option is D
will contract but its final length will be greater than original length.
Stress-strain graph of a ductile material is shown in figure. OA→Proportional limit OB→Elastic limit B→Upper yield stressC→Lower yield stress D→Ultimate strength E→Fracture
shows yield point. Material is elastic up to this point B
. If the material is strained up to point B
, then on releasing it will regain its original shape ⇒
If material is strained beyond B
, then it will get deformed permanently, i.e if it is released after straining upto point B
, it will have an elongation represented by OQ
The material will contract but it won't regain original shape, rather its length will be larger than original.