If $x$ longitudinal strain is produced in a wire of Young's modulus $y,$ then energy stored in the material of the wire per unit volume is
  • A$y{x^2}$
  • B$2\,y{x^2}$
  • C$\frac{1}{2}{y^2}x$
  • D$\frac{1}{2}y{x^2}$
AIIMS 2001, Medium
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