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[" Three conducting rods of same "],[" m...

[" 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 "BD" and "BC" if there is no heat flow in "AB" is "],[[" (a) "2/7," (b) "7/2," (c) "9/2," (d) "2/9]]

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