Physics-
General
Easy
Question
The identical square rods of metal are welded end to end as shown in figure, 
cal of heat flow through this combination in 4 min. If the rods were welded as shown in figure, the same amount of heat will flow through the combination in
- 16 min
- 12 min
- 1 min
- 4 min
The correct answer is: 4 min
From 
In arrangement (b), 
is doubled and 
is halved.
time
min= 1 min
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