Three conducting rods of same material and cross-section are shown in figure. Temperatures of A, ...

Three conducting rods of same material and cross-section are shown in figure. Temperatures of A, D and C are maintained at 20^∘C, 90^∘C and 0^∘C. The ratio of lengths B D and B C, if there is no heat flow in A B is
A
(a) 2/7
(b) 7/2
(c) 9/2
(d) 2/9

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