Question
Can the potential function have a maximum or minimum in free space?
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A current I flows in a conductor placed perpendicular to the plane of the paper.Indicate the direction of the magnetic field due to a small element d $\overrightarrow{l}$at point P situated at a distance $ \overrightarrow{r}$ from the element as shown in the figure.


$\Big[$Hint: $\frac{\triangle\text{A}}{\text{A}}=2\frac{\triangle\text{r}}{\text{r}}\Big]$