Heat flow across a hollow sphere of inner radius 'r1' and outer radius 'r2' is directly proportional to

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This question belongs to Chemical Engineering Chemical Engineering Basics

Chemical Engineering Basics

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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 & Solution

Correct Answer: Option B

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