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A uniform metal rod of 2mm^(2) area of c...

A uniform metal rod of `2mm^(2)` area of cross section is heated from `0^(@)C` to `20^(@)C`. The coefficient of linear expansion of the rod is `12xx10^(-6)//""^(@)C`. Its Young's modulus of elasticity is `10^(11)N//m^(2)`, then the energy stored per unit volume of rod is,

A

`1440J//m^(3)`

B

`1500J//m^(3)`

C

`2880J//m^(3)`

D

`5760J//m^(3)`

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