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[" A ring consisting of two parts "ADB" and "ACB" of same conductivity k carries an amount "],[" of heat "H." The "ADB" part is now replaced with another metal keeping the temperatures "],[T_(1)" and "T_(2)" constant.The heat carried increases to "2" H.What should be the conductivity "],[" of the new "ADB" part? Given "(ACB)/(ADB)=3" : "],[[" (A) "(7)/(3)k," (B) "2k," (C) "(5)/(2)k," (D) "3k]]

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