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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

data not sufficient

Text Solution

Verified by Experts

assume that there is no `'PQ'` Rod
Then `T_(P)=(100)/(2)=50^(@)C`
`T_(Q)=45^(@)C`
`T_(P) gt T_(Q)implies` Heat flow from `P` to `Q`
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