Fleming’s left-hand rule

The left-hand rule is one of the three rules used in electromagnetics to determine the relationship between magnetic fields, currents, and the direction of force. It is mainly used to determine the direction of force acting on an electrified wire in a magnetic field, as well as the direction of the force exerted by the magnetic field on moving charges. Extend your left hand and straighten your index finger, middle finger, and thumb so that they are perpendicular to each other in space. At this point, the direction of the index finger represents the direction of the magnetic field, the middle finger represents the direction of the current, and the direction pointed by the thumb is the direction in which the conductor is subjected to force. Operating instructions: Press the start button and observe the changes in the wire when it is powered on.

The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.