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Question

For a given material, the Young's modulus is $$2.4$$ times that of rigidity modulus. Its poisson's ratio is.


A
2.4
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B
1.2
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C
0.4
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D
0.2
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Solution

The correct option is D $$0.2$$
$$Y=2\eta(1+\sigma)$$
$$\Rightarrow 2.4\eta =2\eta(1+\sigma)$$
$$\Rightarrow 1.2=1+\sigma$$
$$\Rightarrow \sigma=0.2$$

Physics

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