(chatquestion)...70, An spherical vessel of material of conductivity k, inner and outer radii r, and r2 contains a liquid, maintained at temperature T1. The outside temperature is T2 (T2<T¡), the rate of heat loss is- (T-T2) (12 -1) (T-T2) (r2 - ) (T-T2) (1, - ) (T;-T2 ) (12 -1 ) (1) k.G12 (2) 2k.T.12 (3) 4k.T.I2 (4) 8k.T.12

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