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Q.

Two identical square rods of metal are welded end to end as shown in figure (a), 20 calories of heat flows through it in 4 minutes. If the rods are welded as shown in figure (b). The same amount of heat will flow through the rods in

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a

1 minute

b

2 minutes

c

4 minutes

d

16 minutes

answer is A.

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Detailed Solution

20=KA(100−0)(2L)×4, Now 20=K(2A)(100−0)L×t⇒t=1 minute
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