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A slab consists of two layers of two different materials of same thickness having thermal conductivities and , the equivalent conductivity of the combination in series is
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Correct option is C
In series slabs are,for 2 slabs of same thickness l having coefficient of thermal conductivities K1,K2 is since, in series effective resistance is Rseries=R1+R2 Resistance is R=lKA, here l = thickness, K=coefficient of thermal conductivity, A=area of cross section Rseries=R1+R2 l+lKseriesA=lK1A+lK2A ⇒Kseries=2K1K2K1+K2Similar Questions
Two rods of length and and coefficients of thermal conductivities and are kept touching each other. Both have the same area of cross-section. The equivalent of thermal conductivity is
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