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Q.45. Two identical square rods of metal are welded end to end as shown in figure (1), 20 calories of heat flows through it in 4 minutes. If the rods are welded as shown in figure (2), the same amount of heat will flow through the rods in -
(1) 1 minute
(2) 2 minutes
(3) 4 minutes
(4) 16 minutes
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Answer:
Explanation:
As the diagram is not given in both the cases, I am giving the general concept behind finding the time taken for the heat to flow from one rod to the other, the rate of heat flow through rods is proportional to the thermal conductivity of the rods, the equivalent thermal conductivity of the rods may vary depends on the orientation of the combination in which the rod is connected.
For same amount of flow of heat
K1 Q÷t1=K2×Q÷t2
As the values of Q and t1 are given and the value of thermal conductivity K1 and K2 can be found from the orientation of the rods the value of time t2 can be found.
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