| 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
Correct Answer: D
Solution :
[d] \[\operatorname{t}\propto \frac{\ell }{A},t'\propto \frac{2\ell }{A/2}\Rightarrow t'=4t=4\times l2=48\]
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