In bio savart law direction of magnetic field is shown by $d\vec B = \frac{{{\mu _0}}}{{4\pi }}\frac{{I\overrightarrow {dl}  \times \vec r}}{{{r^3}}}$

  • A

    $\vec r \times I\overrightarrow {dl} $

  • B

    $I\overrightarrow {dl}  \times \vec r$

  • C

    $(A)$ and $(B)$

  • D

    None

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