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The rate of flow of heat through $12$ identical conductors made of same material is as shown in the figure. Then, which of the following is correct?

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The rate of flow of heat through rod $D E$ is $9 J / s$

Junctions $C$ and $F$ are at the same temperature

Junctions $A$ and $G$ are at the same temperature

The rate of flow of heat through $C F$ is $5 J / s$

answer is A, B.

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Detailed Solution

Net heat supplied to the system = Net heat removed from the system.

Therefore 2+4+3+2 =1+E+1 $\Rightarrow E = 9 J / s$

Since each arm of the square has the same thermal resistance ,heat flowing from A to C is 1J/s.The same quantity of heat is removed from the system through junction C . Hence heat flowing from C to F is zero .

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