A cylindrical insulation for a steam pipe has an inside radius of s cm, an outerradius of 10 cm, and a thermal conductivity of 0.5 W/(m K). The outer surface of the insulation is exposed to ambient air with a heat transfer coefficient of 5 W/m2 K. What is the critical radius? O a. 200 mm O b. 100 mm Oc 50 mm O d. 10 mm
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