Two identical square rods of metal are welded end to end as shown in f – McqOptions

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1.	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 [NCERT 1982]
A.	1 minute
B.	2 minutes
C.	4 minutes
D.	16 minutes
Answer» B. 2 minutes

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