A) 24 s
B) 3 s
C) 1.5 s
D) 48s
Correct Answer: D
Solution :
Let the heat transferred be Q. When rods are joined end to end. Heat transferred by each rod\[=Q=\frac{KA\Delta \theta }{l}\times 12\] ?..(i) When rods are joined lengthwise, \[Q=\frac{KA\Delta \theta }{2l}t\] ?..(ii) From equation (i) and (ii) we get \[t=48\ s\]You need to login to perform this action.
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