This is a vivid demonstration to show that like charges repel one another. The electric plume has a number of colored ribbons attached to a vacuum cup. When the vacuum cup is attached to the top of a Van de Graaff generator, the ribbons will slowly acquire a charge, even though they are normally thought of as insulators or non-conductors. As the charge builds, the ribbons will stand away from the dome and from each other.
Additional ResourcesNo Additional Resources at the time.
Flinn Catalog/Reference Manual Page 679
Flinn Middle School Catalog/Reference Manual Page 409