By what rule is the direction of Ampere’s force determined?

The Ampere force F is perpendicular to the direction of the current / and the magnetic induction vector B. To determine the direction of the Ampere force, the left hand rule is used. If you position your left hand so that four outstretched fingers indicate the direction of the current in the conductor, and the lines of magnetic induction enter the palm, then the thumb bent (in the plane of the palm) 90 will show the direction of the Ampere force acting on the conductor.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.