Q. A long cylindrical flask with inner and outer diameters and respectively is completely filled with ice as shown in the figure-4.48. The constant temperature outside the flask is . (Thermal conductivity of the flask is .

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A

Rate of heat flow from outside to the flask is

B

The rate at which ice melts is

C

The rate at which ice melts is

D

Rate of heat flow from outside to flask is

Solution:

Integrating we have

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