When a plastic ruler is rubbed on silk cloth it becomes positively charged
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The charging of an object by rubbing it with another object is called charging by friction.
1) The charging of a glass rod by rubbing it with a silk cloth.
2) When a plastic comb is rubbed with dry hair, the plastic comb acquires an electric charge due to friction.
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When a plastic ruler is rubbed with a cloth, the free electrons from the cloth are transferred to the plastic ruler. The cloth on losing electrons has less number of electrons, and therefore gets positively charged the plastic ruler on the other hand has more number of electrons and thus becomes negatively charged.
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