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A uniform metal rod of 2 mm^2 cross-sect...

A uniform metal rod of `2 mm^2` cross-section is is heated from 0C to `20^circ C`. The coefficient of linear expansion of the rod `1`2 xx 10^(-6)circC^( -1). Its Youngs modulus of elasticity is `10^(11) Nm^(-2). Energy stored per unit volume of the rod is

A

`2880 Jm^(-3)`

B

`1440 Jm^(-3)`

C

`1500 Jm^(-3)`

D

`5760 Jm^(-3)`

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