"The Poisson's ratio depends only on the nature of the material and not at all on the stress applied within elastic limit" - Explain.

The modulus elasticity of rubber is greater than that of steel.

The stretching of a coil is determined by its shearing modulus.

When a material is under tensile stress, the restoring forces are caused by interatomic attraction. While under compressional stress the restoring force is due to interatomic repulsion.

A piece of rubber under an ordinary stress can display $100\%$ strain ; yet when unloaded it returns to its original length. This shows that the restoring forces in a rubber piece are strictly conservative.

Elastic forces are strictly conservative when Hooke's law is obeyed.