Name two pairs of substances which when rubbed together produce electricity
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"When you rub a plastic comb with dry hair it will attracts bits of paper and an ebonite rod when rubbed with a woollen or silk cloth will also attract paper or some other thing.
When you rub a plastic scale against u r hair and place some pieces of paper near it. They get attracted due to static electric force.
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Answer:
plastic comb and plastic straw
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