Question

A given material has Young's modulus E, modulus of rigidity G and Poisson's ratio 0.25. The ratio of Young's modulus to modulus of rigidity of this material is

• A. $3.75$
• B. $3$
• C. $2.5$
• D. $1.5$

Answer 1

The correct option is C $2.5$

$Modulusofrigidity,G=\frac{E}{2(1+\mu )}$
$\therefore \frac{E}{G}=2\times (1+0.25)=2.5$