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The figure shows a system of two concent...

The figure shows a system of two concentric spheres of radii `r_(1)`, and `r_(2)` and kept at temperatures `T_(1)` and `T_(2)`, respectively. The radial rate of flow of heat in a substance between the two concentric spheres is proportional to

A

`(r_(1)r_(2))/(r_(2)-r_(1))`

B

`(r_(2)-r_(1))`

C

`((r_(2)-r_(1)))/(r_(1)r_(2))`

D

`log_(e)((r_(2))/(r_(1)))`

Text Solution

Verified by Experts

The correct Answer is:
A
`H=-k4pir^(2)(dT)/(dr)impliesHprop(r_(1)r_(2))/(r_(2)-r_(1))`
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