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A steel wire of mass mu per unit length ...

A steel wire of mass `mu` per unit length with a circular cross section has a radius of 0.1 cm. The wire is of length 10 m when measured lying horizontal, and hangs from a hook on the wall. A mass of 25 kg is hung from the free end of the wire. Assuming the wire to be uniform and lateral strains < < longitudinal strains, find the extension in the length of the wire. The density of steel is 7860 `kg m^-3` (Young's modulues ` Y = 2 xx 10^11 N m^-2)`

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