The figure shows a system of two concentric spheres of radii ${r_1}$ and ${r_2}$ are 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

Question

$In\left( {{{{r_2}} \over {{r_1}}}} \right)$

${{\left( {{r_2} - {r_1}} \right)} \over {\left( {{r_1}{r_2}} \right)}}$

${\left( {{r_2} - {r_1}} \right)}$

${{{r_1}{r_2}} \over {\left( {{r_2} - {r_1}} \right)}}$

Solution

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