What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.
(A) 2
(B) 8
(C) 10
(D) 40
(A) 2
(B) 8
(C) 10
(D) 40