A simple pendulum made of a bob of mass $m$ and a metallic wire of negligible mass has time period $2s$ at  $T = 0\,^oC$ . If the temeprature of the wire is increased and the corresponding change in its time peirod is plotted against its temperature, the resulting graph is a line of slope $S$. If the coefficient of linear expansion of metal is $\alpha $ then the value of  $S$ is

  • [JEE MAIN 2016]
  • A

    $\frac {\alpha }{2}$

  • B

    $2\alpha $

  • C

    $\alpha $

  • D

    $\frac {1}{\alpha }$

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