A thick rope of density $\rho$ and length $L$ is hung from a rigid support. The Young's modulus of the material of rope is $Y$. The increase in length of the rope due to its own weight is
  • A$(1 / 4) \rho gL ^2 / Y$
  • B$(1 / 2) \rho g L ^2 / Y$
  • C$\rho g L ^2 / Y$
  • D$\rho g L / Y$
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