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Five rods of same dimensions are arranged as shown in the figure. They have thermal conductivities \( K_{1}, K_{2}, K_{3}, K_{4} \) and
\( \mathrm{P} \) \( K_{5} \). When points \( A \) and \( B \) are maintained at different

W temperatures, no heat flows through the central rod if
[KCET 2002]
(a) \( K_{1}=K_{4} \) 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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