Interchange factor for infinitely long concentric cylinders is given b

1.	Interchange factor for infinitely long concentric cylinders is given by
A.	1/ [A<sub>1</sub>/A<sub>2 </sub>(1/E<sub> 2</sub> 1)].
B.	[1/E<sub> 1</sub> + A<sub>1</sub>/A<sub>2 </sub>(1/E<sub> 2</sub> 1)].
C.	2/ [1/E<sub> 1</sub> + A<sub>1</sub>/A<sub>2 </sub>(1/E<sub> 2</sub> 1)].
D.	1/ [1/E<sub> 1</sub> + A<sub>1</sub>/A<sub>2 </sub>(1/E<sub> 2</sub> 1)].
Answer» E.

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Interchange factor for infinitely long concentric cylinders is given by

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