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Hooke's law of elasticity is applicable 

Hooke's law of elasticity is applicable  Correct Answer Within elastic unit

Correct option-3

Concept:

According to Hooke’s law,
“For small deformation, the stress in a body is proportional to the corresponding strain.”

i.e. stress  ∝ strain 
or stress = (E) (strain)
Here, E is a constant called the modulus of elasticity.
Now, depending upon the nature of the deforming force applied on the body, stress, strain, and

hence modulus of elasticity are classified into the following three types:
1. Young's modulus
2. Bulk modulus and
3. Modulus of rigidity

Explanation:

  • Hooke's law of elasticity is only valid within the elastic limit of material because-
  • Beyond the elastic limit, the material is not going to regain its original shape and size after the removal of the force.
  • This applied force is called deforming force while force applied by material to restore the original size is called restoring force.

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For the given stress-strain graph E is the elastic limit of a material.

Hence, option-3 is correct

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