Rubbing can charge insulators like wool, plastic and rubber.
There two types of charges:
- Charged insulators can attract dust, fibres and small pieces of paper
- An insulator losing electrons will have a positive charge
- An insulator gaining electrons will have a negative charge
- Like charges repel and opposite charges attract
- A polythene rod rubbed with a duster acquires a negative charge and the duster acquires an equal but opposite positive charge
- The force between two charged objects are equal in size and act in opposite direction
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