The value of Young's modulus for a perfectly rigid body is ...........
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(d)
For perfectly rigid body the condition is that there should not be any elognation $(\Delta L=0)$ for any value of force
So from the formulae we know $\frac{F L}{A \cdot \Delta L}=Y$
If we put $\Delta L=0$
We get $Y$ as $\infty$
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