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CGP EDU Academic Team
Published on: September 12, 2026
The ratio of the coefficient of thermal conductivity of two different materials is 5 : 3. If the thermal resistance of the rod of same thickness resistance of the rods of same thickness of these materials is same, then the ratio of the length of these rods will be
Text Solution
Verified by ExpertsThe correct answer is:
B
Thermal resistances are same
$\Rightarrow \frac{l_1}{K_1 A_1} = \frac{l_2}{K_2 A_2} \Rightarrow \frac{l_1}{K_1} = \frac{l_2}{K_2} (\therefore A_1 = A_2)$ $\Rightarrow \frac{l_1}{l_2} = \frac{K_1}{K_2} = \frac{5}{3}$
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