Questions
Two rods of length and and coefficients of thermal conductivities and are kept touching each other. Both have the same area of cross-section. The equivalent of thermal conductivity is
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Correct option is D
When two rods are connected in series Q=A(T1−T2)td1 K1+d2 K1=A(T1−T2)t(d1+d2)/K⇒d1+d2 K=d1 K1+d2 K2⇒K=(d1+d2)d1 K1+d2 K2
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The temperatures across two different slabs A and B are shown in the steady state (as shown in figure).The ratio of thermal conductivities of A and B is
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