Consider a composite slab consisting of two different materials having equal thickness and therm...

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Consider a composite slab consisting of two different materials having equal thickness and thermal conductivities \( K \) and \( 2 K \) respectively. The equivalent thermal conductivity of the slab is
(a) \( \frac{2}{3} K \)
(b) \( \sqrt{2} K \)
(c) \( 3 \mathrm{~K} \)
(d) \( \frac{4}{3} K \)
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