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JEE Main 2014 Question Paper

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Question : 20

Total: 90

Three rods of copper,Brass and Steel are welded together to from a Y -shaped structure.Area of cross-section of each rod =4cm2,Each of copper is maintained at 100°C where as ends of brass and steel are kept at 10°C.length of the copper,brass and steel rods are 46,13 and 12 cms respectively.The rods are thermally insulated from surrounding except a ends.Thermal conductive of copper,brass and steel are 0.92,0.26 and 0.12 CGS units respectively. Rate of heat flow through copper rod is:

4.8 cal/s
6.0 cal/s
1.2 cal/s
2.4 cal/s

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