बायोट-सावर्ट नियम का सही सदिश रूप है

• A
  $\delta \vec{B} = \frac{\mu_{0}}{4 \pi} \frac{I(d\vec{l} \times \vec{r})}{r^{3}}$
• B
  $\delta \vec{B} = \frac{\mu_{0}}{4 \pi} \frac{I(d\vec{l} \times \vec{r})}{r^{3}}$
• C
  $\delta \vec{B} = \frac{\mu_{0}}{4 \pi} \frac{I(\vec{r} \times d\vec{l})}{r^{3}}$
• D
  $\delta \vec{B} = \frac{\mu_{0}}{4 \pi} \frac{I(d\vec{l} \times \vec{r})}{r^{2}}$