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A slab consists fo two parallel layer of...

A slab consists fo two parallel layer of different materials of same thickness and thermal conductivities `K_1` and `K_2`.The equivalent thermal conductivity off the slab is :

A

`K_1+K_2`

B

`K_1K_2`

C

`((K_1 + K_2) /2 )`

D

`(2K_1K_2)/((K_1+K_2) )`.

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JBD PUBLICATION-Thermodynamics-EXAMPLE
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