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