Three identical rods $AB$, $CD$ and $PQ$ are joined as shown. $P$ and $Q$ are mid points of $AB$ and $CD$ respectively. Ends $A, B, C$ and $D$ are maintained at $0^o C, 100^o C, 30^o C$ and $60^o C$ respectively. The direction of heat flow in $PQ$ is

86-169

  • A

    from $P$ to $Q$

  • B

    from $Q$ to $P$

  • C

    heat does not flow in $PQ$

  • D

    data not sufficient

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