Choose the correct relationship between Poisson ratio $(\sigma)$, bulk modulus (K) and modulus of rigidity $(\eta)$ of a given solid object :

Question

$\sigma=\frac{3 K+2 \eta}{6 K+2 \eta}$

$\sigma=\frac{3 K-2 \eta}{6 K+2 \eta}$

$\sigma=\frac{6 K+2 \eta}{3 K-2 \eta}$

$\sigma=\frac{6 K-2 \eta}{3 K-2 \eta}$

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