The figure shows a thermal network of two metal rods of same cross section area. If the heat current from the ends $A$ and $B$ is 130 W, find the heat current through the curved metal rod.

Question

The figure shows a thermal network of two metal rods of same cross section area. If the heat current from the ends A and B is 130 W, find the heat current through the curved metal rod.

TestHub · Accepted Answer

Rod resistance is proportional to length. The curved rod (70 cm) is in parallel with the straight middle rod (60 cm), so the current divides in the inverse ratio of length: the curved rod carries 130 × 60 + 70 60 ​ = 60 W.

Physics - Heat & Thermo Question with Solution | TestHub

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