Determining the Direction of Ampere Force (Left - Hand Rule)

Rule: Extend the left hand with the thumb perpendicular to the other four fingers. Let the magnetic field lines enter the palm perpendicularly, and point the four fingers in the direction of the current. Then the thumb points in the direction of the Ampere force. Applicable Conditions: Used to determine the force direction on a current (direction of positive charge flow) in a magnetic field. Explanation: This is a common method for determining the direction of the Ampere force, providing an intuitive representation of the cross product F = I l × B.