TRIBO-ELECTRIC SERIES
The series in which the substances are arranged according to their tendency to lose or gain electrons on rubbing each other. The higher the position of the substance, it has the tendency to lose electrons and to gain positive charge on rubbing.
The series of common substances follows,
Air
Human hair
Rabbit's fur
Glass
Hair
Silk
Paper
Cotton
Steel
Wood
Amber
Rubber balloon
Plastic wrap
Ebonite
Example:
When glass rod is rubbed with silk, the rod loses electrons and get positively charged whereas silk gains electrons from the rod and gets negatively charged. Please check the position of glass in relation with silk. Glass is placed above silk.