If x longitudinal strain is produced in a wire
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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 [MP PMT 1987, 89, 92; CPMT 1997; Pb. PMT 1999; KCET 2000; AIIMS 2001]
A) y{{x}^{2}} B) 2\,y{{x}^{2}} C) \frac{1}{2}{{y}^{2}}x D) \frac{1}{2}y{{x}^{2}}