Consider the insulating sheets with thermal resistance R1 and R2 as shown. The temperature at the ends of the arrangement is θ1 and θ2 then represent θ in term of given variables:
A
θ1θ2R1R2(θ1+θ2)(R1+R2)
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B
θ1R1+θ2R2(R1+R2)
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C
(θ1+θ2)R1R2R21+R22
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D
θ1R2+θ2R1R1+R2
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Solution
The correct option is Dθ1R2+θ2R1R1+R2
Heat current reaching the junction = heat current leaving the junction.