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A metallic wire is suspended by suspendi...

A metallic wire is suspended by suspending weight to it. If S is longitudinal strain and Y its young's modulus of elasticity then potential energy per unit volume will be

A

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

B

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

C

`(1)/(2)YS^(2)`

D

`2YS^(2)`

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