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Hooke's law:
 
 

It states that when the material is loaded within the elastic limit the stress is directly proportional to strain.

i.e. Stress α strain

or Stress = Constant x Strain

or Stress = Modulus of elasticity x Strain

or Stress/Strain = Modulus of elasticity

 

In the figure the material obeys the hooke's law up to point A.

 
   

 

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