this is a question of physics class 12th chapter 1 electric charges and fields
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Rubbing produces charges of equal magnitude. However, they are of opposite nature on the two bodies as charges are always created in pairs. This phenomenon of charging is known as charging by friction. The total net charge on the system of two rubbed bodies is zero. This is because equal amounts of opposite charges annihilate each other. When a glass rod is rubbed with a silk cloth, opposite charges appear on both the bodies. This phenomenon is in alignment with the law of conservation of energy. A similar phenomenon can be observed with many other pairs of bodies due to the production of opposite charges.
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