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Define Young's modulus of elasticitiy. n...

Define Young's modulus of elasticitiy. normal stress and longitudinal strain. Give unit of each of them. Derive an expression for the elastic potential energy of a wire, when stretched.

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Modulus of elasticity: It is the ratio of the stress to strain.
Units: N `m^(-2)` in SI.
Types of modulus of elasticity
i) Young.s modulus of elasticity (Y)
ii) Bulk modulus of elasticity (B)
iii) Modulus of rigidity or Shear modulus (G).
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