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 d \[\vec{L}\] only
Correct Answer: C
Solution :
Biot-Savart law states\[d\overrightarrow{B}=\frac{{{\mu }_{0}}}{4\pi }\frac{id\overrightarrow{L}\times \overrightarrow{r}}{{{r}^{3}}}\] \[\therefore \]Direction of\[d\overrightarrow{B}\]is perpendicular to both\[d\overrightarrow{L}\] and \[\overrightarrow{r}\].
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