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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediumsingle choice

Two cylindrical rods of the same material have the same temperature difference between their ends. The ratio of the rates of flow of heat through them is 1 : 8. The radii of the rods are in the ratio 1 : 2. What is the ratio of their lengths?

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Answer:

Solution:

The rate $\propto \frac{r ^{2}}{l}$ . $\frac{1}{8} = \frac{\frac{1}{4}}{\frac{l _{1}}{l _{2}}}$ gives $\frac{l _{1}}{l _{2}} = \frac{8}{4} = 2$ . The ratio is 2 : 1. A.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

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