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Given that Y represents Youngs modulus a...

Given that Y represents Youngs modulus and `sigma` represents the strain. Which of the following gives the energy stored per unit volume of a strained wire ?

A

`1/2 Y sigma`

B

`1/2 Y^2 sigma`

C

`1/2 Y (sigma)^2`

D

`1/2 Y^2 (sigma)^2`

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