Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Problem 5: A hollow sphere is constructed of aluminum with an inner diameter of 4 cm and an outer diameter of 8 cm. The inside temperature is 100◦C and the outer temperature is 50◦C. Calculate the heat transfer.

Problem 6: Suppose the sphere in Problem 5 is covered with a 1-cm layer of an insulating material having k = 50 m W/m · ◦C and the outside of the insulation has a temperature of 35 oC. The inside of the sphere remains at 100◦C. Calculate the heat transfer under these conditions.

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