Elementary motor: De La Rive Tube - out of service
• D+30+25
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+30+31
Electromagnet with removable core D+30+30
Force on current carrying wire in a magnetic field D+30+0
Suspended magnetic lodestone on string. D+30+1
Large compass needle on stand. D+30+2
Dip needle compass. D+30+4
Earth model with internal magnet and pivoting probe magnet. D+30+6
Iron filings and permanent magnets to show field on an OHP. D+30+8
Compass needle shows field around a high current wire on bench top. D+30+10
Iron filings around a high current vertical wire on OHP to show field. D+30+12
Iron filings around a current carrying coil on OHP to show field. D+30+14
Magnetic field around a solenoid with pivoting probe magnet. D+30+16
Ampere's law: Currents in parallel wires attract or repel. D+30+18
Force on a current carrying wire in a magnetic field. D+30+20
Elementary motor: Bar on rails over solenoid with core. D+30+22
Torque on coil suspended between two magnets. D+30+24
Vacuum tube with screen shows cathode rays bent with a magnet. D+30+26
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Hall effect: Magnetic field induces a voltage in a neon plasma. D+30+35
Applet: Magnet and Compass D+30+40
Applet: Magnets and Electromagnets D+30+45
Applet: Current Loop D+30+50
Applet: Force on Moving Charges D+30+55
Applet: Magnetostatics Index D+30+60
Applet: Magnetic Field D+30+65
Applet: 3-D Magnetostatic Field Simulation