The heat is flowing through two cylindrical rods of the same material. The diameters of the rods are in the ratio 1 : 2 and their lengths are in the ratio 2 : 1. If the temperature difference between

Question

The heat is flowing through two cylindrical rods of the same material. The diameters of the rods are in the ratio 1 : 2 and their lengths are in the ratio 2 : 1. If the temperature difference between their ends is the same, the ratio of rates of flow of heat through them will be:

Options:

Answer:

D

Solution:

The rate $\propto \frac{d ^{2}}{l}$ . $\frac{\frac{1}{2}}{\frac{4}{1}} = \frac{1}{8}$ . The ratio is 1 : 8. D.

TestHub · Accepted Answer

The rate ∝ l d 2 ​ . 1 4 ​ 2 1 ​ ​ = 8 1 ​ . The ratio is 1 : 8. D.

Physics - Heat & Thermo Question with Solution | TestHub

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