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

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 2 – r 1/4πk r 1r 2
B.	r 2 /4πk r 1r 2
C.	r 1/4πk r 1r 2
D.	4πk r 1r 2
Answer» B. r 2 /4πk r 1r 2

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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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