Five rods of same dimensions are arranged as shown in the figure. They have thermal conductivities $K1, K2, K3, K4$ and $K5$ . When points $A$ and $B$ are maintained at different temperatures, no heat flows through the central rod if
Five rods of same dimensions are arranged as shown in the figure. They have thermal conductivities $K1, K2, K3, K4$ and $K5$ . When points $A$ and $B$ are maintained at different temperatures, no heat flows through the central rod if
- A
${K_1} = {K_4}\,{\rm{and}}\,\;{K_2} = {K_3}$
- B
${K_1}{K_4} = {K_2}{K_3}$
- C
${K_1}{K_2} = {K_3}{K_4}$
- D
$\frac{{{K_1}}}{{{K_4}}} = \frac{{{K_2}}}{{{K_3}}}$
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