A hollow cylinder has length L, inner radius r1, outer radius r2, and thermal conductivity k. The thermal resistance of the cylinder for radius conduction is

\(\frac{{\ln\;\left( {{r_1}/{r_2}} \right)}}{{2\pi kL}}\)

\(\frac{{\ln\;\left( {{r_2}/r_1} \right)}}{{2\pi kL}}\)

\(\frac{{2\pi kL}}{{\ln\;\left( {{r_2}/{r_1}} \right)}}\)

\(\frac{{2\pi kL}}{{\ln\;\left( {{r_1}/{r_2}} \right)}}\)

A hollow cylinder has length L, inner radius r1, outer radius r2, and

1.	A hollow cylinder has length L, inner radius r1, outer radius r2, and thermal conductivity k. The thermal resistance of the cylinder for radius conduction is
A.	\(\frac{{\ln\;\left( {{r_2}/r_1} \right)}}{{2\pi kL}}\)
B.	\(\frac{{\ln\;\left( {{r_1}/{r_2}} \right)}}{{2\pi kL}}\)
C.	\(\frac{{2\pi kL}}{{\ln\;\left( {{r_2}/{r_1}} \right)}}\)
D.	\(\frac{{2\pi kL}}{{\ln\;\left( {{r_1}/{r_2}} \right)}}\)
Answer» B. \(\frac{{\ln\;\left( {{r_1}/{r_2}} \right)}}{{2\pi kL}}\)

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A hollow cylinder has length L, inner radius r1, outer radius r2, and thermal conductivity k. The thermal resistance of the cylinder for radius conduction is

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