experimental tool for the relation of current - magnetic field

摘要

The present invention provides the experimental apparatus for the current and magnetic field related to the device, which allows the students to easily change the direction and intensity of the current and to visually see the change in the magnetic field.;The present invention for this purpose is a bar-shaped wire bar through which current can flow; A plate member having a center axis of the wire bar and having a plurality of light emitting elements and compasses installed on different concentric circles; Disclosed is a technical configuration including a light emitting device driving circuit for allowing a current to flow through the plurality of light emitting devices when a current flows through the wire bar.