Question
Write expression in vector form for produced magnetic field due to small part of a current carrying conductor in Biot$-$Savart law.
✓
Answer
$\overrightarrow{8 B}=\frac{\mu_0 I}{4 \pi r} \frac{\overrightarrow{\delta l} \times \vec{r}}{r^3}$
or $\overrightarrow{8 B}=\frac{\mu_0 I}{4 \pi r} \frac{(\overrightarrow{\delta i} \times \vec{r})}{r^2} $
or $\overrightarrow{8 B}=\frac{\mu_0 I}{4 \pi r} \frac{(\overrightarrow{\delta i} \times \vec{r})}{r^2} $
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