Move grass seeds to demonstrate electric fields patterns. This demo uses metal electrodes charged using a hand crank van de Graaff or Wimshurst machine. Set in plexiglass, a container of oil and grass seed is placed on top of the electrodes. Once charged, the grass seeds will move. The entire apparatus is set on top of an overhead projector for class viewing.
Good for use in PHYS102, PHYS141, PHYS151, and PHYS171.