An atom will become charged when it gains or loses an electron. Gaining one or more electrons gives it a negative charge and losing one or more electrons gives it a positive charge.
- When we put a polythene rod (negatively charged) and a perspex rod (positively charged) together they attract due to their opposite charge.
- When we put two polythene rods together they repel and the same happens with two perspex rods as like charges repel.
An insulating material can become electrically charged when rubbed which is a result of gaining or losing electrons. This happens because in an insulating material the electrons are not free to move and so a charge can build up. This does not happen as easily on conductors as the electrons are free to move and so charge does not build up as easily. Metals are an example.
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