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Work done $= \large\frac{1}{2} $$ \times$ Young's module $ \times$ strain $^2$ $ \times$Volume

$W=\large\frac{1}{2}$$ \times Y \times \large \frac{\Delta l^2}{L^2} \times$$ AL$

$\qquad= \large\frac{Y A \Delta L^2}{2L}$

$\qquad= \large\frac{2 \times 10^{11} \times 10^{-6} \times 10^{-6}}{2 \times 1}$

$\qquad=0.1\;J$

Hence d is the correct answer.

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