The elastic energy stored per unit volume in a stretched wire is....

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The elastic energy stored per unit volume in a
\( \mathrm{P} \)
stretched wire is
W
(1) \( \frac{1}{2} \frac{\text { stress }}{Y} \)
(2) \( \frac{1}{2} \frac{(\text { stress })^{2}}{Y} \)
(3) \( \frac{1}{2} \frac{(\text { stress })^{2}}{Y^{2}} \)
(4) \( \frac{1}{2} \frac{\text { stress }}{Y^{2}} \)


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