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The ratio of the areas of cross-section ...

The ratio of the areas of cross-section of two rods of different materials is `1:2`, and the ratio of the thermal conductivities of their materials is `4:3`. On keeping equal temperature-difference between the ends of these rods, the rate of conduction of heat are equal. Determine the ratio of the lengths of the rods.

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The correct Answer is:
`2:3`
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