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Three identical rods AB, CD and PQ are j...

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^(@)C`, `100^(@)C`, `30^(@)C` and `60^(@)C` respectively. The direction of heat flow in `PQ` is

A

From P to Q

B

From Q to P

C

Heat does not flow in PQ

D

Date not sufficient

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The correct Answer is:
A
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