Question: Two rods whose lengths are l1 and l2 and heat conductivity coefficients 1 and 2 are placed end to end. Find the heat conductivity coefficient

Two rods whose lengths are l1 and l2 and heat conductivity coefficients ×1 and ×2 are placed end to end. Find the heat conductivity coefficient of a uniform rod of length l1 + l2 whose conductivity is the same as that of the system of these two rods. The lateral surfaces of the rods are assumed to be thermally insulated.

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