The magnetic field at the origin due to a current element $\vec{i \, d\ell}$ placed at a point with position vector $\vec{r}$ is

Question

$\frac{\mu_0 i \, \vec{r} \times \vec{d\ell}}{4\pi r^2}$

$\frac{\mu_0 i \, \vec{d\ell} \times \vec{r}}{4\pi r^3}$

$\frac{\mu_0 i \, \vec{r} \times \vec{d\ell}}{4\pi r^3}$

$\frac{\mu_0 i \, \vec{d\ell} \times \vec{r}}{4\pi r^2}$

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