MHT CET Physics question
A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conduct heat '' in time 't'. The metallic rod is now melted and the material is formed into a rod of half the radius of the original rod. This rod when placed in thermal contact with the same two reservoirs of heat, conducts heat '' in time 't'. The difference in heat conducted, () is [MHT-CET 2012]
Answer: (C)
Solution
Halving the radius makes the area , and for constant volume the length becomes 4 times; since , and
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