An amazing demonstration of the interaction of electric forces. Place a non-conducting racing ball between the top disk and a connected lower pan. When the Van de Graaff generator is started the ball will dramatically race around the bottom pan as the force of the upper disk repels it. The ball can acquire great speed with a powerful Van de Graaff generator.
The Racing Ball comes with complete step-by-step instructions. An Insulating Stand AP5990, insulated wire, and a Van de Graaf generator are required.