A) 7 hours
B) 14 hours
C) 21 hours
D) 3.5 hours
Correct Answer: C
Solution :
[c] Since no heat flows through me central rod, temperature at the ends of the central rod will be same. So, it will form a wheatstone like network. So.\[\frac{{{K}_{1}}}{{{K}_{2}}}=\frac{{{K}_{3}}}{{{K}_{4}}}\Rightarrow {{k}_{1}}{{k}_{4}}={{k}_{2}}{{k}_{3}}\]
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