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A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large. | |
A. | 5 minutes [Correct Answer] |
B. | 10 minutes [Wrong Answer] |
C. | 20 minutes [Wrong Answer] |
D. | 40 minutes [Wrong Answer] |