The left hand rule or Fleming's rule is a law used in electromagnetism that determines the movement of a conductor that is immersed in a magnetic field or the direction in which the force is generated within it.
In a conductor that is inside a magnetic field perpendicular to it and through which a current is circulated, a force is created whose direction will depend on how both magnitudes interact. This force that appears as a result is called the Lorentz force. To obtain the direction of the force, take the index finger of the left hand pointing to the direction of the magnetic field that interacts with the conductor and point the middle finger in the direction of the current flowing through the conductor, forming an angle of 90 degrees. In this way, the thumb determines the direction of the force that driver will experience.
Conventions:
* The direction of the mechanical force points the same as the finger.
*The direction of the magnetic field is from north to south.
*The current flows in the conventional direction, that is, from positive to negative.