what happens if a plastic ruler rubs with wool
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When you rub the plastic scale with the wool cloth, the scale charges negative and wool charges positive & they together create electricity .....
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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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