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Q.

Two identical plates of metal are welded end to end as shown in Fig.
(A) 20 cal of heat flows through it in 4 minute. If the plates are welded as shown in Fig.
(B) the same amount of heat will flow through the plates in.

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a

1 minute

b

2 minute

c

4 minute

d

16 minute

answer is A.

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Detailed Solution

$\frac{20 cal}{4 \min} = \frac{KA (T_{1} - T_{2})}{2 l} and \frac{20 cal}{t \min} = \frac{K (2 A) (T_{1} - T_{2})}{l} \Rightarrow t = 1 \min$

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