A) infinite
B) zero
C) \[10\times {{10}^{10}}N/{{m}^{2}}\]
D) \[1\times {{10}^{10}}N/{{m}^{2}}\]
Correct Answer: A
Solution :
Youngs modulus of a material is given by \[Y=\frac{F\times L}{A\times \Delta L}\] where \[F\to \] applied force \[A\to \] area of cross-section \[L\to \] initial length \[\Delta L\to \] change in length For a perfectly rigid body, \[\Delta L=0\] \[\therefore \] \[Y=\infty \] (infinite)
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