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Two rods made of same material, have same thermal conductivities and area of cross-section. It is observed that to conduct same amount of heat between temperatures T1 and T2, rod 1 takes twice the time as the other. Find the ratio of their lengths.

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Two rods made of same material, have same thermal conductivities and area of cross-section. It is observed that to conduct same amount of heat between temperatures T1 and T2, rod 1 takes twice the time as the other. Find the ratio of their lengths.



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