Q 11-08-062JEE MainJEE Main 2023 (8 Apr, Shift 1)Easy
An aluminium rod with Young's modulus $Y=7.0\times10^{10}\ \text{N m}^{-2}$ undergoes elastic strain of $0.04\%$. The energy per unit volume stored in the rod in SI unit is
Answer: (C) 5600
$u=\tfrac12Y(\text{strain})^2=\tfrac12\times7\times10^{10}\times(4\times10^{-4})^2=5600\ \text{J m}^{-3}$.
Solution by Sreeraj P, M.Sc Physics