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A structural steel rod has a radius r(=1...

A structural steel rod has a radius r(=10 mm) and a length l(=1 m). When a force F(= 100 kN) is applied, it stretches it along its length. Young's modulus of elasticity of the structural steel is `2.0xx10^(4) Nm^(-2)`. What is the elastic energy density of the steel rod ?

A

`6.12xx10^4 J//m^3`

B

`1.25xx10^4 J//m^3`

C

`2.5xx10^4 J//m^3`

D

`2.5xx10^4 J//m^3`

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