A rod of Young.s modulus 20 GPa undergoes a linear strain of 6xx10^(-4). Then increase in its energy density is ---

A rod of Young.s modulus 20 GPa undergoes a linear strain of 6xx10^(-4

1.	A rod of Young.s modulus 20 GPa undergoes a linear strain of 6xx10^(-4). Then increase in its energy density is ---
Answer» `3600Jm^(-3)` `7200Jm^(-3)` `1800Jm^(-3)` NONE ANSWER :1