Three conducting rods of same material and cross-section are shown ...

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Three conducting rods of same material and cross-section are shown in figure. Temperature of A, D and \( \mathrm{C} \) are maintained at \( 20^{\circ} \mathrm{C}, 90^{\circ} \mathrm{C} \) and \( 0^{\circ} \mathrm{C} \). Find the ratio of length \( \mathrm{BD} \) and \( \mathrm{BC} \) if there is no heat flow in AB.
\( \mathrm{P} \)
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