Interchange factor for body 1 completely enclosed by body 2 (body 1 is

1.	Interchange factor for body 1 completely enclosed by body 2 (body 1 is large) is given by
A.	2/ [1/E<sub> 1</sub> + A<sub>1</sub>/A<sub>2 </sub>(1/E<sub> 2</sub> 1)].
B.	1/ [1/E<sub> 1</sub> + A<sub>1</sub>/A<sub>2 </sub>(1/E<sub> 2</sub> 1)].
C.	4/ [1/E<sub> 1</sub> + A<sub>1</sub>/A<sub>2 </sub>(1/E<sub> 2</sub> 1)].
D.	3/ [1/E<sub> 1</sub> + A<sub>1</sub>/A<sub>2 </sub>(1/E<sub> 2</sub> 1)].
Answer» C. 4/ [1/E<sub> 1</sub> + A<sub>1</sub>/A<sub>2 </sub>(1/E<sub> 2</sub> 1)].

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