CMAT 2022 Solved Question Paper

Volume of copper wire melted will be equal to volume of sphere.
Volume of copper wire = Area $\times$ length $=\mathrm{\pi }{\left(\frac{2}{19}\right)}^2\times 24300{\mathrm{cm}}^3$
Let the radius of sphere be r
$\frac{4}{3}\mathrm{\pi }{\mathrm{r}}^3=\mathrm{\pi }{\left(\frac{2}{10}\right)}^2\times 24300{\mathrm{cm}}^3$
${\mathrm{r}}^3=729$
$\mathrm{r}=9\mathrm{cm}$
Diameter of sphere $=2\left(9\right)=18\mathrm{cm}$
Answer is option B.