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Q.

Two rods are of same material and have same length and area. Heat ∆Q flows through them in 12 minutes, when they are joined side by side. If now both the rods are joined inparallel, then the same amount of heat ∆Q will flow in:

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a

24 min

b

3 min

c

12 min

d

6 min

answer is B.

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Detailed Solution

∆Q∆t=KA∆Tl⇒∆Q12=KA(∆T)2l and                     ∆Qt=K(2A)∆Tl⇒t=3 min.
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