Two identical square rods of metal are welded end-to-end as shown in Fig. (1). 20 calories of heat will flow through it in 4 minutes. If the rods are welded as shown in Fig. (2), the same amount of heat flows through the rods in
Text Solution
Verified by ExpertsThe correct answer is:
A
In case (i) 
… (i)
In case (ii) 
… (ii)
[In 2nd case area becomes double and thickness is half]
eq 
(ii) 
(i) gives,
.
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