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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` are kept at temperature `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

`ln((r_(2))/(r_(1)))`

B

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

C

`r_(2)-r_(1)`

D

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

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