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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 in figure (i) But When they tire joined as shown in figure (ii), then they will transfer same heat in same. conditions in
189411_900862b981aa4dab82bb55f50a8747c5.png

A
24 s
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B
13 s
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C
15 s
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D
48 s
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Solution

The correct option is C 48 s
We know that heat flow is given as: Q=KAΔTL
If they are connected parallel to each other, t LA
Now, if they are connected in series then: t2LA2
So, t=4×t=4×12=48 second

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