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Find stress required to double the length of a wire of Young’s modulus Y

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Find stress required to double the length of a wire of Young’s modulus Y

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Let L be the length of a wire.

If the length of a wire is doubled, the longitudinal strain will be

Plus One Physics Mechanical Properties of Solids Two Mark Questions and Answers 2

Young’s modulus Y =  \(\frac{Stress}{Strain}\)

∴ Y = Stress (∵ Strain = 1).

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