Identify the correct boundary condition for a hollow sphere with insid

1.	Identify the correct boundary condition for a hollow sphere with inside surface insulate?
A.	At r = r <sub>1</sub>, the conduction region is perfectly insulated
B.	At r = r <sub>1</sub>, the conduction region is partially insulated
C.	Heat flow is infinity
D.	Heat flow is negative
Answer» B. At r = r <sub>1</sub>, the conduction region is partially insulated

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