Question

When a glass rod is rubbed with silk the glass rod gets positive charge why?

Answer 1

When you are rubbing the glass rod with the silk cloth, electrons are stripped away from the atoms in the glass and transferred to the silk cloth. This leaves the glass rod with more positive than negative charge, so you get a net positive charge.

Answer 2

The glass rod gets positive charge because of frictional effect . The electrons move from glass rod to silk creating a electron deficiency. thus glass rod gets positive charge when rubbed with silk.