If the volume of a block of metal changes by $0.12\%$ when it is heated through $20^o\,C$, the coefficient of linear expansion (in per $^oC^{-1}$) of the metal is :-

  • A

    $10^{-5}$

  • B

    $2 \times 10^{-5}$

  • C

    $3 \times 10^{-5}$

  • D

    $5 \times 10^{-5}$

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