A plastic ruler is a rubber vigorously with a woollen cloth
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If the plastic ruler is rubbed vigorously with a woolen cloth, then they get both positively and negatively charged. Explanation: When the ruler is rubbed with a woolen cloth, the ruler will get a positive charge and the woolen cloth will get a negative charge.
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Rubbing the ruler with a cloth transfers electrons from the fabric to the ruler, resulting in a negative charge and an excess of electrons. They are attracted because electrons migrate away from the ruler, leaving a positive charge on the paper near the ruler.
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