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[" Five rods of same dimensions "],[" ar...

[" Five rods of same dimensions "],[" are arranged as shown in "],[" figure.They have thermal "],[" conductivities "K_(1),K_(2),K_(3),K_(4)],[" and "K_(5)." When points "A" and "B],[" are maintained at different "],[" temperatures,no heat flows "],[" through the central rod if "],[" (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) None of the above "]

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