Q .     Young's modulus of the material of a wire is `Y`. If it is under a stress `S`, the energy stored per unit volume is given by:

MHCET 2011
A

`\frac{1}{2}\ \frac{S}{Y}`

B

` \frac{1}{2}\ \frac{S^2}{Y}`

C

` \frac{1}{2}\ \frac{S}{Y^2}`

D

` \frac{1}{2}\ \frac{S^2}{Y^2}`

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