A plastic ruler is rubbed vigorously …
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Amar Kumar 8 years, 4 months ago
Some of the outer electrons in some atoms are held less strongly to the atom than the outer electrons in some other atoms. For instance, the outer electrons of the atoms in wool are held more loosely than the outer electrons of the atoms in a plastic ruler. 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, it has an excess of negative electric charge If a negatively charged plastic ruler is brought near to a positively charged Perspex rod, they gently attract each other.
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