Two identical square rods of metal are welded end to end as shown in fig. (1) 20 cal. of heat flows through it in 4 min. If the rods re welded as shown in fig. (2), the same amount of heat will flow through the rods in-
Text Solution
Verified by ExpertsThe correct answer is:
A
Figure (1) 
series combination
Figure (2) 
parallel combination
Thermal resistance for each block to be 
Then
Thermal resistance for the case I 
Thermal resistance for the case II 
Thermal resistance for case II
Then
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