Heat is flowing through two cylindrical rods of the same material. The diameters of the rods are in the ratio $1 : 2$ and their lengths are in the ratio $2 : 1$. If the temperature difference between their ends is the same, then the ratio of the amounts of heat conducted through per unit time will be

  • A

    $1:1$

  • B

    $2:1$

  • C

    $1:4$

  • D

    $1:8$

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  • [AIIMS 1998]

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