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Question: Two rods of same length and transfer a given amount of heat 12 second, when they are joined as shown...

Two rods of same length and transfer a given amount of heat 12 second, when they are joined as shown in figure (i). But when they are joined as shown in figure (ii), then they will transfer same heat in same conditions in

A

24 s

B

13 s

C

15 s

D

48 s

Answer

48 s

Explanation

Solution

t µ lA\frac{\mathcal{l}}{A} , t' µ 2lA/2\frac{2\mathcal{l}}{A/2}