An elastic material of Young's modulus $Y$ is subjected to a stress $S$. The elastic energy stored per unit volume of the material is
  • A$\frac{{2Y}}{{{S^2}}}$
  • B$\frac{{{S^2}}}{{2Y}}$
  • C$\frac{S}{{2Y}}$
  • D$\frac{{{S^2}}}{Y}$
IIT 1992,AIIMS 1997,AIEEE 2005, Easy
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