Direction of Magnetic Field when Current Flows from South to North
When the current flows from South to North, the direction of the magnetic field is East to West. This phenomenon can be explained using the right-hand rule of electromagnetism.

Right-hand Rule of Electromagnetism
According to the right-hand rule, if the thumb of your right hand points in the direction of the current (from South to North in this case), and your fingers curl in the direction of the magnetic field, then your palm will face towards the East. This indicates that the magnetic field lines are oriented from East to West.

Explanation
When a current flows through a conductor, a magnetic field is generated around the conductor. The direction of this magnetic field is perpendicular to both the direction of the current flow and the plane formed by the conductor. In the case of current flowing from South to North, the magnetic field lines form a closed loop around the conductor, with the magnetic field oriented from East to West.

Conclusion
In conclusion, when the current flows from South to North, the magnetic field is directed from East to West. This relationship can be understood using the right-hand rule of electromagnetism, which helps in determining the direction of the magnetic field based on the direction of current flow.