Two identical square rods of metal are welded end to end as shown in figure (1) Assume that 10cal of heat flows through the rods in2 min. Now the rods are welded as shown in figure. (2) The time it would take for 10 cal to flow through the rods now, is
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a
0.75 min
b
0.5 min
c
1.5 min
d
1 min
answer is B.
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Detailed Solution
In (1) dQdt=102cal/min=AK100−02a.AlternatelyQt1=dθ2akA Qt2=dθak2A t2=t14