Two conductors having thicknesses $$d1$$ and $$d2$$ , thermal conductivities $$K1$$ and $$K2$$ are placed one above the other. The equivalent thermal conductance is:

Correct option is 3K1K2(d1+d2)d1K2+d2K1

Questions

Two conductors having thicknesses d₁ and d₂ , thermal conductivities K₁ and K₂ are placed one above the other. The equivalent thermal conductance is:

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d1+d2K2d2+K2d12K1+K2

(d1-d2)(K1d2+K2d1)1(K1+K2)

K1K2(d1+d2)d1K2+d2K1

none of the above

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detailed solution

Correct option is C

Here, d1+d2kA=d1K1A+d2K2A So, K=K1K2(d1+d2)d1K2+d2K1

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Two conductors having thicknesses d1 and d2 , thermal conductivities K1 and K2 are placed one above the other. The equivalent thermal conductance is:

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Two conductors having thicknesses d₁ and d₂ , thermal conductivities K₁ and K₂ are placed one above the other. The equivalent thermal conductance is: