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Two slabs different materials with iden...

Two slabs different materials with identical dimensions have their thermal condcutivities `lambda_1 and lambda_2` respectively . When they are placed in contact with each other such that heat flows from one into the other ( placed in series ) , the equivalent thermal conductivity of the composite wall is given by

A

`(lambda_1 lambda_2)/(lambda_1 + lambda_2)`

B

`lambda_1 + lambda_2 `

C

`(2 lambda_1 + lambda_2)/(lambda_1 + lambda_2)`

D

`(lambda_1 + lambda_2)/(2)`

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The correct Answer is:
A
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