A metallic rod of length $I$ and cross-sectional area $A$ is made of a material of Young's modulus $Y$. If the rod is elongated by an amount $y$, then the work done is proportional to ......
  • A$y$
  • B$\frac{1}{y}$
  • C$y^2$
  • D$\frac{1}{y^2}$
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