Physics Demonstrations at Cal Poly Pomona
Demo Index:
Pira Index:
Title:
Description:
The strip of tape creates a charge wihich is seen on the Electroscope as it is ripped off from the metal plate.
Equipment:
1. Electroscope (large)
2. Vise w/ round metal plate
3. Clip lead A-B
4. PVC platform (1’ square)
5. Clear packing tape 2” wide
6. Maglight
7. Lens holder & base
8. Screen
Procedure:
1. Set up as shown below.
2. Rub tape strips onto round plate, then pull off tape without touching the metal plate. Tap the electroscope if needle sticks. The needle shows static charge.
3. Bring the 2 tape strips near each other & they repel (like charges).
4. Place tape strips one on the back of the other, then rub them onto the plate. Pull them off and separate. Note that the strips now attract.
