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For a material, Young's modulus is 2.4 times its modulus of rigidity. What is the Poisson's ratio of the material?

1. 2.4
2. 1.2
3. 0.4
4. 0.2

Correct answer: 0.2

Solution

Y = 2*eta*(1+sigma) with Y = 2.4*eta gives 1+sigma = 1.2, so sigma = 0.2.

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