Questions
A cylinder of radius R made of a material of thermal conductivity K1 is surrounded by a cylindrical shell of inner radius R and outer radius 2R made of a material of thermal conductivity K2. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in steady state. The effective thermal conductivity of the system is
detailed solution
Correct option is B
Qt=Q1t+Q2t Qt=KAθ1−θ2LKot π4R2dθL=K1π4R2dθL+K2π3R2dθL⇒Kof =K1+3K24Similar Questions
Water can be heated in a cup of paper because:
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