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A cylindrical rod having temperature 1 T and 2 T at its ends. The rate of flow of heat is 1 Q cal/sec. If all the linear dimensions are doubled keeping temperature constant then rate of flow of heat 2 Q will be

1. 1 4 Q
2. 1 2 Q
3. 4 1 Q
4. 2 1 Q

Correct answer: 1 2 Q

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