In Searle’s apparatus for measurement of Young’s modulus, a steel wire of length 2m and
area of cross-section 6 2 2.5 10^-6 m^2 − × is suspended from a torsion head. When a weight of
5 kg is suspended at its free-end, its length increases. Calculate the work done on the
wire. Take Young’s modulus of steel as 2 10^11 Nm .
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