A rod $C D$ of thermal resistance $10.0\; {KW}^{-1}$ is joined at the middle of an identical rod ${AB}$ as shown in figure, The end $A, B$ and $D$ are maintained at $200^{\circ} {C}, 100^{\circ} {C}$ and $125^{\circ} {C}$ respectively. The heat current in ${CD}$ is ${P}$ watt. The value of ${P}$ is ... .

981-988

  • [JEE MAIN 2021]
  • A

    $2$

  • B

    $3$

  • C

    $1$

  • D

    $4$

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  • [IIT 1978]