question_answer

A steel wire of1\[m\]long and 1\[m{{m}^{2}}\] cross section area is hanged from rigid end when weight of 1 kg is hang from it, then change in length will be (Youngs coefficient for wire\[Y=2\times {{10}^{11}}N\text{/}{{m}^{2}}\])

A)  0.5 mm               

B)  0.25 mm

C)  0.05 mm         

D)         5 mm