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The magnetic field \( d \vec{B} \) due to a small current element \( d l \) at a distance \( \vec{r} \) and element carrying
\( \mathrm{P} \)
current \( i \) is
W
(1) \( \overrightarrow{d B}=\frac{\mu_{0}}{4 \pi} i\left(\frac{\overrightarrow{d l} \times \vec{r}}{r}\right) \)
(2) \( d \vec{B}=\frac{\mu_{0}}{4 \pi} i^{2}\left(\frac{\overrightarrow{d l} \times \vec{r}}{r}\right) \)
(3) \( \overrightarrow{d B}=\frac{\mu_{0}}{4 \pi} i\left(\frac{\overrightarrow{d l} \times \vec{r}}{r^{2}}\right) \)
(4) \( \overrightarrow{d B}=\frac{\mu_{0}}{4 \pi} i\left(\frac{\overrightarrow{d l} \times \vec{r}}{r^{3}}\right) \)
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