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Q. The Young’s modulus of a perfectly rigid body is

BITSATBITSAT 2012

Solution:

From Hooke's law, Young modulus $Y=\frac{\text { Stress }}{\text { Strain }}$
The Strain produced in a perfectly rigid body is zero
i.e Strain $=0$
$\therefore Y =\frac{\text { Stress }}{0} $
$ \Rightarrow Y =\infty$
Thus the Young's modulus of perfectly rigid body material is infinite.