Different combination of cylinder are shown in the figure. Select the correct alternatives for the thermal resistance of the following combinations :
A thin cylinder of diameter 'd' is surrounded by another cylinder.

Question

Different combination of cylinder are shown in the figure. Select the correct alternatives for the thermal resistance of the following combinations :

A thin cylinder of diameter 'd' is surrounded by another cylinder.

TestHub · Accepted Answer

I st combination :- ​ R eq ​ = R 1 ​ + R 2 ​ R 1 ​ R 2 ​ ​ ​ R 1 ​ = k ⋅ π d 2 L × 4 ​ , ​ R 2 ​ = 3 k ⋅ π [ 4 d 2 − d 2 ] L × 4 ​ = 9 kπ d 2 4 L ​ ​ R eq ​ = 5 kπ d 2 2 L ​ ​ I nd combination ​ R eq ​ = R 1 ​ + R 2 ​ ​ R 1 ​ = k A L ​ , R 2 ​ = 4 k A L ​ ​ R eq ​ = k A L ​ [ 1 + 4 1 ​ ] = 4 k A 5 L ​ ​

Physics - Heat & Thermo Question with Solution | TestHub

Options:(select one or more)

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