A constant current flows in a horizontal wire in the plane of the paper from east to west as shown in the figure. The direction of magnetic field at a point will be North to South

The direction of the magnetic field can be determined by right-hand rule - "When the thumb points in direction of the current, the direction of curling of fingers will give the direction of magnetic field."
Therefore only at a point directly below the wire, the magnetic field will be exactly from north to south.