Define young’s modulus of elasticity and the expression for stretched wire.
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Answer:Consider a body of length L and of cross section area A. Suppose on applying force F, elongation x is produced in the body. Then, the Young's modulus of elasticity of the material of the body is given by, Y=FLAx. ∴F=YALx. Then, small work done to produce an infinitesimally small extension dx is given by, dW=Fdx.
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