Elementary motor: Electron beam revolves in magnetic field.

• D+45+6

diagram for demo

Elementary motor: Electron beam revolves in magnetic field. The glass tube in this apparatus is evacuated, with a trace of helium added. A large D.C. voltage is placed across the tube terminals, creating an arc of glowing ionized gas. When a key-switch is pressed, a current flows through a coil at the base of the tube, creating a magnetic field in an iron rod that extends up into the tube. The magnetic field is at an angle to the current in the arc of glowing gas, causing the glowing arc to rotate.

Related Demos

D+45+0 Rolling bar motor: Same as D+30+ 20. D+45+2 Elementary split-ring armature DC motor. D+15+6 as a motor. D+45+4 AC induction motor: Armature in a whirling field. D+45+8 Elementary motor: Magnet, wire and battery make a simple motor. D+45+10 Elementary motor: Magnets and battery and copper coil make a simple motor. D+45+12 Applet: AC circuits: alternating current electricity D+45+11 Simple motor rolls straight and in circle