Two plates of equal areas are placed in contact with each other. Their thickness are 2.0 cm and 5.0 cm respectively. The temperature of the external surface of the first plate is maintained at − 2 0 ∘

Question

Two plates of equal areas are placed in contact with each other. Their thickness are 2.0 cm and 5.0 cm respectively. The temperature of the external surface of the first plate is maintained at $- 2 0^{\circ} C$ and that of the external surface of the second plate is maintained at 20°C. What will be the temperature of the contact surface in steady state if the plates have thermal conductivities in the ratio 2 : 5.

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Answer:

A

Solution:

$R_{1} = \frac{2}{2 CA}; R_{2} = \frac{5}{5 CA} \Rightarrow R_{1} = R_{2} T_{interface} = 0^{\circ} C$

TestHub · Accepted Answer

​ R 1 ​ = 2 CA 2 ​ ; R 2 ​ = 5 CA 5 ​ ​ ⇒ R 1 ​ = R 2 ​ ​ T interface ​ = 0 ∘ C ​

Physics - Heat & Thermo Question with Solution | TestHub

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