The radius of a sphere is 6 cm. It is melted and drawn into a wire of radius 0.2 cm. The length of the wire is

Here, radius of sphere $\left({\mathrm{r}}_1\right)=6 \mathrm{cm}$

radius of wire $\left({\mathrm{r}}_2\right)=0.2 \mathrm{cm}$

$\therefore$ Length of wire $=\frac{\frac{4}{3}\times \pi \times r_1^3}{\pi r_2^2}=\frac{\frac{4}{3}\times \frac{22}{7}\times 6\times 6\times 6}{\frac{22}{7}\times 0.2\times 0.2}$

= 7200 cm = 72 m 

So, Length of the wire is 72 m.