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Answer: Option 1
The heat transfer by conduction through a thick cylinder (Q) is given by Q = [2πlk (T₁ - T₂)]/2.3 log (r₂/r₁)where T₁ = Higher temperature, T₂ = Lower temperature, r₁ = Inside radius, r₂ = Outside radius, l = Length of cylinder, and k = Thermal conductivity
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