$A$ wire of length $40 \text{ cm}$ is stretched by $0.1 \text{ cm}$. The strain on the wire is

  • A
    $25 \times 10^{-4}$
  • B
    $40 \times 10^{-4}$
  • C
    $10 \times 10^{-4}$
  • D
    $12.5 \times 10^{-4}$

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