A uniform rod of mass $m$, length $L$, area of cross-section $A$ and Young's modulus $Y$ hangs from the ceiling. Its elongation under its own weight will be
  • A
    Zero
  • B$\frac {mgL}{2AY}$
  • C$\frac {mgL}{AY}$
  • D$\frac {2mgL}{AY}$
Diffcult
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