The figure shows a system of two concentric spheres of radii 
and 
are kept at temperatures 
and 
, respectively. The radial rate of flow of heat in a substance between the two concentric spheres is proportional to
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Consider a shell of thickness 
and of radii 
and the temperature of inner and outer surfaces of this shell be 
rate of flow of heat through it
To measure the radial rate of heat flow, integration technique is used, since the area of the surface through which heat will flow is not constant.
Then, 
or 
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