A uniform metal rod fixed at its ends of...

A uniform metal rod fixed at its ends of `2 mm^(2)` cross-section is cooled from `40@^C` to `20^@C`. The coefficient of the linear expansion of the rod is `12xx10^(-6) ` per degree celsius and its young's modulus of elasticity is `10^11 N//m^(2).` The energy stored per unit volume of the rod is

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