ELECTRIC CHARGE:
You may have noticed that after combing your hair on a fine, dry day, the comb can attract small pieces of paper. Have you also ever experienced a mild electric shock when you touched a metal door knob in an air-conditioned room?
In general, when two different materials (especially insulating materials) are rubbed against each other, negative charges (Electrons) will transfer from one object to the other so that one object becomes positively charged and the other becomes negatively charged.
For instance, when a polythene strip is rubbed with wool the friction causes a certain amount of negative charge (electrons) to be transferred from the wool to the polythene strip. Hence the strip becomes negatively charged. On the other hand, the wool has lost the same amount of electrons and therefore become positively charged. This method is known as charging by friction.
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