5. Circular fins of uniform cross section, with diameter of 10 mm and length of 50 mm, are attached to a wall with surface temperature of 350 °C. The fins are made of a material with thermal conductivity of 240 W/m-K, and they are exposed to an ambient temperature of 25 °C, and the convection heat transfer coefficient is 250 W/m²-°C. Derive the equation to determine the temperature distribution though the fin when the fin tip temperature is constant at 250 °C.
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