Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are 
and 
and cross-sectional areas 
and 
respectively. If the rate of heat conduction in 1 is four times that in 2, then
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Let 
be length of each rod.
Rate of heat flow in rod 1 for the temperature difference 
is
Rate of heat flow in rod 2 for the same difference 
is
As per question, 
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