For a given material , The young's modulus is 2.4 times that of rigidity modulus. It's Poisson's ratio is ::

Question

\[\begin {array} {1 1} (a)\;1.2 \\ (b)\;1.02 \\ (c)\;0.2 \\ (d)\;2 \end {array}\]

Answer 1

$Y= 2 \eta (1+ \sigma)$

But $Y= 2.4 \;\eta$

$\therefore 2.4 \eta =2 \eta (1+\sigma)$

$(1+ \sigma)=1.2$

$\sigma =0.2$

Hence c is the correct answer.