Heat and Thermal ExpansionHard

Question

Two identical square rods of metal are end are welded end to end as shown in figure (a) 20 calories flows through it in 4 minutes. If the rods are welded as shown in figure (b), The same amount of heat will flow through the rods in :-
       

Options

A.1 minute
B.2 minute
C.4 minute
D.16 minute

Solution

Fig A : 20 = × 4
Fig A : 20 Q = (100 - θ)
Equation (i) / (ii) 1 = t = 1 min.

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