Critical radius of insulation of a hollow cylinder is

1.	Critical radius of insulation of a hollow cylinder is
A.	\(\frac{2k}{h}\)
B.	\(\frac{k}{2h}\)
C.	\(\frac{k}{h}\)
D.	\(\sqrt \frac{k}{h}\)
Answer» D. \(\sqrt \frac{k}{h}\)

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