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A composite slab is prepared by pasting ...

A composite slab is prepared by pasting two plates of thickness `L_(1)` and `L_(2)` and thermal conductivities `K_(1)` and `K_(2)` . The slab have equal cross-sectional area. Find the equivalent conductivity of the composite slab.

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`R_(eq) = R_(1) + R_(2)`
`(L_(1) + L_(2))/(K_(eq)A) = L_(1)/(K_(1)A) +L_(2)/(K_(2)A)`
`K_(eq) = (L_(1)+L_(2))/(L_(1)/K_(1)+L_(2)/K_(2))`
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