A steel sphere of radius 0.1 m at 400K is immersed in an oil at 300K. If the centre of the sphere reaches 350K 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
B. 20 minutes
C. 10 minutes
D. 40 minutes
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