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Find the increment in the length of a st...

Find the increment in the length of a steel wire of length `5 m` and radius `6 mm` under its own weight. Density of steel `= 8000 kg//m^(3)` and young's modulus of steel `= 2xx10^(11) N//m^(2)`. What is the energy stored in the wire ? (Take g `= 9.8 m//s^(2))`

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