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A composite slab has two layers of different materials with thermal conductivities $$k_{1}$$ and $$k_{2}$$. If each layer has same thickness, then the equivalent thermal conductivity will be:
$$K_{1} K_{2}$$
$$K_{1} + K_{2}$$
2$$\frac{K_{1} K_{2}}{(K_{1} + K_{2})}$$
$$\frac{K_{1} + K_{2}}{(K_{1} K_{2})}$$
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