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[" The ratio of lengths of two rods is "1:2" and "],[" the ratio of coefficient of expansions is "2:],[3." The first rod is heated through "60^(@)C" ."],[" Find the temperature through which the "],[" second rod is to be heated so that its "],[" expansion is twice that of first is "],[[" 1) "60^(@)C," 2) "40^(@)C," 3) "30^(@)C," 4) "10^(@)C]]

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