If the inner and outer surfaces of a hollow cylinder (having radii r1 and r2 and length L) are at temperatures t1 and t2 then rate of radial heat flow will be

\(\frac{k}{{2\pi L}}\;\frac{{{t_1} - {t_2}}}{{\log \frac{{{r_2}}}{{{r_1}}}}}\)

\(\frac{1}{{2\pi Lk}}\;\frac{{{t_1} - {t_2}}}{{\log \frac{{{r_2}}}{{{r_1}}}}}\)

\(\frac{{2\pi L}}{k}\frac{{{t_1} - {t_2}}}{{\log \frac{{{r_2}}}{{{r_1}}}}}\)

\(2\pi Lk\frac{{{t_1} - {t_2}}}{{\log \frac{{{r_2}}}{{{r_1}}}}}\)

If the inner and outer surfaces of a hollow cylinder (having radii r1

1.	If the inner and outer surfaces of a hollow cylinder (having radii r1 and r2 and length L) are at temperatures t1 and t2 then rate of radial heat flow will be
A.	\(\frac{k}{{2\pi L}}\;\frac{{{t_1} - {t_2}}}{{\log \frac{{{r_2}}}{{{r_1}}}}}\)
B.	\(\frac{1}{{2\pi Lk}}\;\frac{{{t_1} - {t_2}}}{{\log \frac{{{r_2}}}{{{r_1}}}}}\)
C.	\(\frac{{2\pi L}}{k}\frac{{{t_1} - {t_2}}}{{\log \frac{{{r_2}}}{{{r_1}}}}}\)
D.	\(2\pi Lk\frac{{{t_1} - {t_2}}}{{\log \frac{{{r_2}}}{{{r_1}}}}}\)
E.	None of the above
Answer» E. None of the above

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If the inner and outer surfaces of a hollow cylinder (having radii r1 and r2 and length L) are at temperatures t1 and t2 then rate of radial heat flow will be

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