The critical radius 'r' of insulation on a pipe is given...

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The critical radius 'r' of insulation on a pipe is given by

A. $${\text{r}} = \frac{{2{\text{k}}}}{{\text{h}}}$$

B. $${\text{r}} = \frac{{\text{k}}}{{\text{h}}}$$

C. $${\text{r}} = \frac{{\text{k}}}{{2{\text{h}}}}$$

D. $${\text{r}} = \frac{{\text{h}}}{{\text{k}}}$$

Answer: Option B

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