How does a plastic ruler after rubbing with woollen cloth attract pieces of paper?
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Shifting electric charges
When you rub the atoms in wool against the atoms in plastic, some of the outer electrons from the atoms in the wool get rubbed off, and they stick to the atoms in the plastic ruler. The surface of the plastic ruler gets coated with the electrons rubbed off the atoms in the wool.
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Rubbing the ruler with a cloth transfers electrons from the cloth to the ruler so the ruler now has an excess of electrons and it is negatively charged. The pieces of paper are neutral. ... Electrons will move away from the ruler leaving a positive charge on the paper near the ruler, so they are attracted.
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