Question:
A composite slab is prepared by pasting two plates of thicknesses $\mathrm{L}_{1}$ and $\mathrm{L}_{2}$ and thermal conductivity $\mathrm{K}_{1}$ and $\mathrm{K}_{2}$. The slabs have equal cross - sectional area. Find the equivalent conductivity of the slab.
Solution:
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