5A40.30 2 X 2 Electrostatic Induction

Concepts

Electrostatic induction, attraction of opposite charges

Overview

A 2" x 2" beam is placed on top of a low-friction watch glass. A PVC pipe is charged by rubbing fur on it (the pipe becomes negatively charged). The pipe is then held alongside one end of the 2 x 2 such that the board slowly rotates and moves toward the rod.

Details

Equipment

  • [1] 2" x 2" beam with watch glass
  • [1] PVC pipe
  • [1] Rabbit's fur
  • [1] Modelling clay (Play-Doh)

Classroom Assembly

  1. Balance the 2 x 2 beam on top of a watch glass. Add modelling clay on either end of the beam to balance it properly.

Important Notes

  • Make sure you hear the build up of charge on the rod. This will be indicated by a crackling noise during charging.
  • As with most electrostatic demonstrations, this works best under 50% humidity.

Script

  1. Rub the fur on the PVC rod.
  2. Hold the near one end of the board. Observe the board moves slowly toward the rod.

 

2 X 4  board, watch glass pivot on stand, electrostatic rods, cat's fur
2 X 4  board, watch glass pivot on stand, electrostatic rods, cat's fur
2 X 4  board, watch glass pivot on stand, electrostatic rods, cat's fur
2 X 4  board, watch glass pivot on stand, electrostatic rods, cat's fur
2 X 4  board, watch glass pivot on stand, electrostatic rods, cat's fur

Additional Resources

References

  • PIRA 5A40.30

Disclaimer

  • Don't attempt this at home!

Last revised

  • 2018

Technicals

Related AV

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If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.