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Question

Young's modulus of perfectly rigid body material is:

A
Infinite
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B
Zero
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C
10×1010N/m2
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D
1×1010N/m2
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Solution

The correct option is B Infinite
From Hooke's law, Young modulus Y=StressStrain
The Strain produced in a perfectly rigid body is zero i.e Strain=0
Y=Stress0 Y=
Thus the Young's modulus of perfectly rigid body material is infinite.

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