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Three slabs of same surface area but dif...

Three slabs of same surface area but different conductivities `k_(1),k_(2),k_(3)` and different thickness `t_(1),t_(2),t_(3)` are placed in close contact. After steady state this combination behaves as a single slab. Find its effective thermal conductivity.

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The correct Answer is:
`(t_1+t_2+t_3)/((t_1)/(k_1)+(t_2)/(k_2)+(t_3)/(k_3))`
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