Heat and Thermal ExpansionHard
Question
The figure shows a system of two concentric spheres of radii r1 and r2 and kept at temperatures T1 and T2 respectively. The radial rate of flow of heat in a substance between the two concentric spheres is proportional to :-
Options
A.
B.(r2 - r1)
C.
D.log 
= - KA
= - K4πr2 
= -4πK
dT
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