Condition for hot body in cold water to maintain it at uniform temperature - Heat Transfer

Q.  Suppose that a hot metal ball is suddenly immersed in cold water. What is the condition for the ball to maintain it at a uniform temperature?
- Published on 12 Aug 15

a. the conduction resistance in a ball should be very large compared to the convection resistance for heat transfer from surface of ball to water
b. the conduction resistance in a ball should be very small compared to the convection resistance for heat transfer from surface of ball to water
c. the conduction resistance in a ball should be equal to the convection resistance for heat transfer from surface of ball to water
d. cannot say

ANSWER: the conduction resistance in a ball should be very small compared to the convection resistance for heat transfer from surface of ball to water

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