The thermal resistance for heat conduction through a hollow sphere of inner radius r1 and outer radius r2 is

r 2 /4‚âà√¨‚àö√ëk r 1 r 2

r 2 ‚Äö√Ñ√∂‚àö√ë‚àö¬® r 1/4‚âà√¨‚àö√ëk r 1r 2

r 2 /4‚âà√¨‚àö√ëk r 1r 2

r 1/4‚âà√¨‚àö√ëk r 1r 2

4‚âà√¨‚àö√ëk r 1r 2

The thermal resistance for heat conduction through a hollow sphere of

1.	The thermal resistance for heat conduction through a hollow sphere of inner radius r1 and outer radius r2 is
A.	r <sub>2</sub> ‚Äö√Ñ√∂‚àö√ë‚àö¬® r <sub>1</sub>/4‚âà√¨‚àö√ëk<sub> </sub>r <sub>1</sub>r <sub>2</sub>
B.	r <sub>2 </sub>/4‚âà√¨‚àö√ëk<sub> </sub>r <sub>1</sub>r <sub>2</sub>
C.	r <sub>1</sub>/4‚âà√¨‚àö√ëk<sub> </sub>r <sub>1</sub>r <sub>2</sub>
D.	4‚âà√¨‚àö√ëk<sub> </sub>r <sub>1</sub>r <sub>2</sub>
Answer» B. r <sub>2 </sub>/4‚âà√¨‚àö√ëk<sub> </sub>r <sub>1</sub>r <sub>2</sub>

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The thermal resistance for heat conduction through a hollow sphere of inner radius r1 and outer radius r2 is

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