For a given material, the Young's modulus is $2.4$ times that of rigidity modulus. Its Poisson's ratio is
Medium
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(d) $Y = 2\eta (1 + \sigma )$
$2.4\eta = 2\eta (1 + \sigma ) \Rightarrow 1.2 = 1 + \sigma \Rightarrow \sigma = 0.2$
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