Demos: 6B-17 Electricity and Magnetism Light Bulb Demo
This demonstration will show the relationship between electricity and magnetism in an unusual way. When a current carrying wire is placed in a magnetic field, each moving charge experiences a Lorentz force. If you take into account the sum of all the Lorentz forces caused by all the moving charges, the wire will deflect.
Directions for doing the demo: Place the unlit light bulb in a position for the students to see and bring the magnet close to the filament. No deflection of the filament will occur. Now light the bulb using DC, then switch it to AC. Students should onote what happens. The filament will vibrate caused by the alternating current flowing through the bulb.
Applications: Lorentz Forces