A metal wire having Poisson's ratio 1/4 ...

A metal wire having Poisson's ratio `1/4` and Young's modulus `8 xx 10^(10) N//m^2` is stretched by a force, which produces a lateral strain of `0.02%` in it. The elastic potential energy stored per unit volume in wire is [in `J/m^3`']

`2.56xx10^4`

`1.78xx10^6`

`3.72xx10^2`

`2.18xx10^5`

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