The thermal resistance for heat conduction through a spherical wall is

1.	The thermal resistance for heat conduction through a spherical wall is
A.	(r<sub>2</sub>-r<sub>1</sub>)/2‚âà√¨‚àö√ëkr<sub>1</sub>r<sub>2</sub>
B.	(r<sub>2</sub>-r<sub>1</sub>)/3‚âà√¨‚àö√ëkr<sub>1</sub>r<sub>2</sub>
C.	(r<sub>2</sub>-r<sub>1</sub>)/‚âà√¨‚àö√ëkr<sub>1</sub>r<sub>2</sub>
D.	(r<sub>2</sub>-r<sub>1</sub>)/4‚âà√¨‚àö√ëkr<sub>1</sub>r<sub>2</sub>
Answer» E.

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The thermal resistance for heat conduction through a spherical wall is

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