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Find equivalent thermal conductivity in the following cases:

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

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  18. Consider a compound slab consisting of two different material having e...

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