Physics - Magnetism Question with Solution | TestHub

A current carrying wire having shape of expending spiral given by the equation $\sqrt{{\mathrm{x}}^2+{\mathrm{y}}^2}={\mathrm{r}}_0+\mathrm{k}{\tan }^{-1}\left(\frac{\mathrm{y}}{\mathrm{x}}\right)$. Where ${\mathrm{r}}_0$ and k are constants with proper dimensions. The value of magnetic field at the origin will be? Use ${\mathrm{r}}_0=4\pi \mathrm{k}$