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A cylindricalinsulation fora steam pipe has an inside radius of 5 cm, an outer radius of 10 cm, and a thermal conducivity of 0.5 W/(m K). The
outer surface of the insulation is exposed to ambient air with a heat transfer coefficient of 5 Wm2 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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