Write the expressions for the work done for (i) paramagnetic substance, and
(ii) stretched wire. Calculate the work done on the steel wire of length 2.5 m and area
of cross-section 2.5 × 10−6 m2 is suspended from torsion head when a 5 kg weight is
suspended at its free end. Take Y = 2 × 1011 Nm−2.
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