Questions
Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are and cross sectional areas , respectively. If the rate of heat conduction in 1 is four times that in 2 , then
detailed solution
Correct option is A
Let L be length of each rod. Rate of heat flow in rod 1 for the temperature difference ΔT isH1=K1A1ΔTLRate of heat flow in rod 2 for the same difference } ΔT is H2=K2A2ΔTLAs per questionH1=4H2 K1A1ΔTL=4K2A2ΔTL K1A1=4K2A2Similar Questions
Water can be heated in a cup of paper because:
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