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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

20 cal4 min=KA(T1-T2)2land 20 calt min=K(2A)(T1-T2)l⇒t=1 min

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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.