First slide

Conduction

Question

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.

Moderate

A

1 minute
B

2 minute
C

4 minute
D

16 minute

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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