Question

The magnetic field at the origin due to a current element $\overrightarrow{id1}$ placed at a point with vector position $\overrightarrow{r}$ is

• A. $\frac{\mu_{0}i}{4\pi} \frac{\overrightarrow{d1} \times \overrightarrow{r}}{r^{3}}$
• B. $\frac{\mu_{0}i}{4\pi} \frac{\overrightarrow{r} \times \overrightarrow{d1}}{r^{3}}$
• C. $\frac{\mu_{0}i}{4\pi} \frac{\overrightarrow{d1} \times \overrightarrow{r}}{r^{2}}$
• D. $\frac{\mu_{0}i}{4\pi} \frac{\overrightarrow{r} \times \overrightarrow{d1}}{r^{2}}$

Answer 1

Answer: (A)

$\frac{\mu_{0} i}{4 \pi} \frac{\overrightarrow{d l} \times \vec{r}}{r^{3}}$