\[\begin {array} {1 1} (a)\;2.5 \times 10^4 J/m^3 \\ (b)\;5.0 \times 10^4 J/m^3 \\ (c)\;7.5 \times 10^4 J/m^3 \\ (d)\;10.0 \times 10^4 J/m^3 \end {array}\]

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$U= \large\frac{1}{2} $$ \times stress \times strain $

$\quad= \large\frac{1}{2}$$ \times y \times (stain)^2$ $\qquad [strain =\large\frac{\Delta L}{L}]$

$\quad= \large\frac{1}{2}$$ \times 2.0 \times 10^{11} \times \bigg(\large\frac{2 \times 10^{-3}}{4}\bigg)^2$

$\quad= 2.5 \times 10^{4} J/m^3$

Hence a is the correct answer.

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