Thermal conductivity through walls of a cylinder of inner and outer ra – McqOptions

MCQOPTIONS

1.	Thermal conductivity through walls of a cylinder of inner and outer radii r1 and r2, respectively is inversely proportional to
A.	(r2 - r1)
B.	\(\frac 1 {r_2 - r_1}\)
C.	\(\ln \left( \frac {r_2}{r_1} \right)\)
D.	\(\frac 1 {\ln \left( \frac {r_2}{r_1} \right)}\)
Answer» D. \(\frac 1 {\ln \left( \frac {r_2}{r_1} \right)}\)

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