The heat flow equation through a cylinder of inner radius r1 and outer radius r2 is desired to be written in the same form as that for heat flow through a plane wall. For wall thickness (r 2-r 1) the area will be

A2 ‚Äö√Ñ√∂‚àö√ë‚àö¬® A1/ log e (A2/A1)

The heat flow equation through a cylinder of inner radius r1 and outer

1.	The heat flow equation through a cylinder of inner radius r1 and outer radius r2 is desired to be written in the same form as that for heat flow through a plane wall. For wall thickness (r 2-r 1) the area will be
A.	A<sub>1</sub> + A<sub>2</sub>/2
B.	A<sub>1</sub> + A<sub>2</sub>
C.	A<sub>2</sub> ‚Äö√Ñ√∂‚àö√ë‚àö¬® A<sub>1</sub>/ log <sub>e </sub>(A<sub>2</sub>/A<sub>1</sub>)
D.	A<sub>1</sub> + A<sub>2</sub>/2 log <sub>e </sub>(A<sub>2</sub>/A<sub>1</sub>)
Answer» B. A<sub>1</sub> + A<sub>2</sub>

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The heat flow equation through a cylinder of inner radius r1 and outer radius r2 is desired to be written in the same form as that for heat flow through a plane wall. For wall thickness (r 2-r 1) the area will be

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