The graph shows the behaviour of a length of wire in the region for which the substance obeys Hook’s law. $P$ and $Q$ represent
  • A$P =$ applied force, $Q =$ extension
  • B$P =$ extension, $Q =$ applied force
  • C$P =$ extension, $Q =$ stored elastic energy
  • D$P =$ stored elastic energy, $Q =$ extension
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