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Que. 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 (r₂-r₁) the area will be
a. A1 + A2/2
b. A1 + A2
c. A2 – A1/ log e (A2/A1)
d. A1 + A2/2 log e (A2/A1)
Correct Answer:A1 + A2/2
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