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Two identical square rods of metal are w...

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

A

16 min

B

12 min

C

1 min

D

4 min

Text Solution

Verified by Experts

The correct Answer is:
C
From `(DeltaQ)/(Delta t)=KA((DeltaT)/(Delta x))`
`Delta t=(DeltaQ Delta x)/(KA (DeltaT))`
In arrangement (b), A is doubled and `Deltax` is halved time
`rArr (1)/(4) xx 4` min = 1 min
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