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Define young's modulus. Give the express...

Define young's modulus. Give the expression for young's modulus of elasticity.

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Young's modulus is defined as the ratio of longitudinal stress to longitudinal strain.
i.e. `Y=("longitudinal stress")/("longitudinal strain")`
For a wire under a stretching force `Y=((Fl)/(A Deltal))Nm^(-2)`
where A area of cross section and F is a stretching force acting normal to the wire.
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