The magnetic field at the origin due to a current element $i d l$ placed at a point with vector position $r$ is
- A$\frac{\mu_{0} i}{4 \pi} \frac{d l \times r}{r^{3}}$
- B$\frac{\mu_{0} i}{4 \pi} \frac{r \times d l}{r^{3}}$
- C$\frac{\mu_{0} i}{4 \pi} \frac{d l \times r}{r^{2}}$
- D$\frac{\mu_{0} i}{4 \pi} \frac{r \times d l}{r^{2}}$
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