प्रतिबल का वह सीमांत मान जहाँ तक प्रतिबल, विकृति के सीधे समानुपाती होता है, क्या कहलाता है?

The ratio of shear stress to the corresponding shear strain within the elastic limit is known as . I. Modulus of rigidity II. Shear modulus

A metal rod of material Young's modulus Y has length ℓ and cross-sectional area A. If its length is doubled and cross-sectional area is halved, what will happen to its Young's modulus Y?