A) of position vector \[\vec{r}\] of the point
B) of current element \[d\,\vec{L}\]
C) perpendicular to both \[d\,\vec{L}\] and \[\vec{r}\]
D) perpendicular to \[\vec{L}\] only
Correct Answer: C
Solution :
Biot- Savart law states \[d\,\vec{B}=\frac{{{\mu }_{0}}}{4\pi }\frac{id\,\vec{L}\times \vec{r}}{{{r}^{3}}}\] \[\therefore \] Direction of \[d\,\vec{B}\] is perpendicular to both \[d\,\vec{L}\] and \[\vec{r}\].
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