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NEET 2015 Physics question

PhysicsThermal Properties of MatterNEET 2015

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

Answer: (3)

Solution

For steady conduction along a rod, the rate of heat flow is , which depends only on the temperature difference between the ends (for given , , ). In both cases the temperature difference

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Question ID VK-091831