A) Length 1 m; radius 1 cm
B) Length 2 m; radius 1 cm
C) Length 2 m; radius 2 cm
D) Length 1 m; radius 2 cm
Correct Answer: D
Solution :
\[\theta =\frac{{{K}_{1}}{{\theta }_{1}}+{{K}_{2}}{{\theta }_{2}}}{{{K}_{1}}+{{K}_{2}}}\]Þ \[\frac{{{K}_{1}}}{{{K}_{2}}}=\frac{5}{3}\] \[{{K}_{1}}=5K\] \[{{K}_{2}}=3K\] is maximum in option (d), hence it will conduct more heat.
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