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The two ends of a metal rod are maintained at temperatures 100°C and 110°C. The rate of heat flow in the rod is found to be 4.0 J/s. If the ends are maintained at temperatures 200°C and 210°C, the rate of heat flow will be

1. 16.8 J/s
2. 8.0 J/s
3. 4.0 J/s
4. 44.0 J/s

Correct answer: 4.0 J/s

Solution

The rate of heat flow in a rod depends on the temperature difference between its ends, not the absolute temperatures. In both cases, the temperature difference is 10°C, so the rate of heat flow remains the same, i.e., 4.0 J/s.

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