# Physics Assignment Help With Hooke's Law and Elastic Modulus

## 9.4 Hooke's Law and Elastic Modulus

On the basis of experiments, Hooke proposed that for smaller values of strain, within a certain limit specific to material, the stress produced in material is proportional to the strain

### 9.5 Young's Modulus

It is defined as ratio of tensile or compressive stress i.e. axial stress to the longitudinal strain i.e.

If a rod of length *L *and area of cross-section *A *is pulled by normal forces *F, *then

Tensile stress = *FIA*

Longitudinal strain =

and Young's modulus Y =

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