Two rods A and B of different materials are welded together as shown in the figure. Their thermal conductivities are K₁ and K₂. The thermal conductivity of the composite rod will be

$fraction numerator straight K subscript 1 space plus space straight K subscript 2 over denominator 2 end fraction$
$fraction numerator 3 space left parenthesis straight K subscript 1 space plus space straight K subscript 2 right parenthesis over denominator 2 end fraction$

k₁ + k₂

k₁ + k₂

fraction numerator straight K subscript 1 space plus space straight K subscript 2 over denominator 2 end fraction

H = H₁+ H₂

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Thermodynamics

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