The work per unit volume to stretch the length by \( 1 \% \) of a wire with cross sectional area...

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The work per unit volume to stretch the length by \( 1 \% \) of a wire with cross sectional area of \( 1 \mathrm{~mm}^{2} \) will be. \( \left[Y=9 \times 10^{11}\right. \) \( \left.\mathrm{N} / \mathrm{m}^{2}\right] \)
[RPET 1999; Similar Kerala PET 2009]
(a) \( 9 \times 10^{11} \mathrm{~J} \)
(b) \( 4.5 \times 10^{7} \mathrm{~J} \)
(c) \( 9 \times 10^{7} \mathrm{~J} \)
(d) \( 4.5 \times 10^{11} \mathrm{~J} \)
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