**WILL GIVE MEDAL** PLEASE HELP!
Electrostatic Charging:
"A hard rubber rod is rubbed with fur and the rod acquires a net negative charge. A glass rod is rubbed with silk, and the rod requires a net positive charge.
So I'm wondering.. Both glass and rubber are insulators. How come one ends up with a net negative and one ends up with a net positive?

Question

**WILL GIVE MEDAL** PLEASE HELP!
Electrostatic Charging:
"A hard rubber rod is rubbed with fur and the rod acquires a net negative charge. A glass rod is rubbed with silk, and the rod requires a net positive charge. 
So I'm wondering.. Both glass and rubber are insulators. How come one ends up with a net negative and one ends up with a net positive?

anonymous · Answer

A vast simplycation is
achieved by noting that there are really only two types of charge.