Effect of Electric Current on Magnetic Field Direction
Electric current flowing in a conductor creates a magnetic field around it. The direction of this magnetic field is perpendicular to the direction of the current flow.

Magnetic Field Direction
When the electric current flows in an east to west direction, the magnetic field produced will be in a north to south direction. This can be explained using the right-hand rule. If you point your right-hand thumb in the direction of the current flow (east to west), then your fingers will curl in the direction of the magnetic field (north to south).

Right-Hand Rule
The right-hand rule is a simple way to determine the direction of the magnetic field produced by a current-carrying conductor. By using your right hand and following the rule, you can easily determine the direction of the magnetic field relative to the current flow.

Conclusion
In conclusion, when an electric current flows east to west, the magnetic effect will be from north to south. This relationship between the direction of the current flow and the resulting magnetic field is an important concept in electromagnetism and is used in various applications such as electromagnets and electric motors.