PQ is a current - carrying long straight conductor in the plane of the paper as shown in the following figure . A and B are two points at distance `r_(1)` and `r_(2)` from it .

Mention the direction of the magnetic field produced by it at point A and B .

Explanation

Using the Right - hand thumb rule and properties of magntic fields lines we find that at point A magnetic field intensity would be perpendicular to the plane of paper in the inward direction `ox` [going into the plane] and at point B it would be perpendicular to the plane of paper in the outward direction `o.` .[coming out of the plane ].