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A composite slab has twolayers of different materials with thermal conductivities $$k_1$$ and $$k_2$$. If each layer has the same thickness , then the equivalent thermal conductivity of the slab will be
$$\frac{2 k_1 k_2}{k_1 + k_2}$$
$$\frac{k_1 + k_2}{k_1 k_2}$$
$$k_1 k_2$$
$$k_1 + k_2$$
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