A Van de Graaf generator can make your hair stand on end, it charges up because:
- The belt rubs against a felt pad and becomes charged
- The belt carries the charge onto an insulated metal dome
- Sparks are produced when the dome can no longer hold any more charge
Rubbing a polythene rod with a dry cloth transfers electrons to the surface atoms of the rod from the cloth, so the polythene rod becomes negatively charged.
Rubbing a perspex rod with a dry cloth transfers electrons from the surface atoms of the rod onto the cloth, so the perspex rod becomes positively charged.
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