Copper of fixed volume $V$ is drawn into wire of  length $l$. When this wire is subjected to a constant force $F$, the extension produced in the wire is $\Delta l$. Which of the following graphs is a straight line?

  • [AIPMT 2014]
  • A

    $\Delta l \rightarrow  \frac {1}{l}$

  • B

    $\Delta l \rightarrow  l^2$

  • C

    $ \Delta l \rightarrow  \frac {1}{l^2}$

  • D

    $\Delta l \rightarrow  l$

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