Two different metal rods of equal lengths and equal areas of cross-section have their ends kept at temperatures θ 1 and θ 2 . k 1 , k 2 are their conductivities, ρ 1 , ρ 2 the densities an

Question

Two different metal rods of equal lengths and equal areas of cross-section have their ends kept at temperatures $θ_{1}$ and $θ_{2}$ . $k_{1}, k_{2}$ are their conductivities, $ρ_{1}, ρ_{2}$ the densities and $s_{1}, s_{2}$ the specific heats. The rate of flow of heat in the two rods will be the same if:

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Answer:

D

Solution:

The rate is $\frac{k A Δ T}{l}$ . For the same $A$ , $l$ and $Δ T$ , it is equal only if $k_{1} = k_{2}$ . Density and specific heat do not appear. D.

TestHub · Accepted Answer

The rate is l k A Δ T ​ . For the same A , l and Δ T , it is equal only if k 1 ​ = k 2 ​ . Density and specific heat do not appear. D.

Physics - Heat & Thermo Question with Solution | TestHub

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