Question

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

• A. $2.4$
• B. $1.2$
• C. $0.4$
• D. $0.2$

Answer 1

The correct option is D $0.2$

$Y=2\eta (1+\sigma )$
$\Rightarrow 2.4\eta =2\eta (1+\sigma )$
$\Rightarrow 1.2=1+\sigma$
$\Rightarrow \sigma =0.2$