Heat flow across a hollow sphere of inner radius 'r1' and outer radius 'r2' is directly proportional to
A. $$\frac{{{{\text{r}}_2} - {{\text{r}}_1}}}{{{{\text{r}}_1} - {{\text{r}}_2}}}$$
B. $$\frac{{{{\text{r}}_2}\,.\,{{\text{r}}_1}}}{{{{\text{r}}_2} - {{\text{r}}_1}}}$$
C. $$\frac{{{{\text{r}}_1} + {{\text{r}}_2}}}{{{{\text{r}}_1}\,.\,{{\text{r}}_2}}}$$
D. $$\frac{{{{\text{r}}_1}\,.\,{{\text{r}}_2}}}{{{{\text{r}}_1} + {{\text{r}}_2}}}$$
Answer: Option B
This Question Belongs to Chemical Engineering >> Chemical Engineering Basics
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