when plastic comb is rubbed with dry hair , it acquires charge due to static electricity and so it attracts pieces of paper which is uncharged.
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When 2 suitable bodies are rubbed, they become oppositely charged due to the transfer of electrons from one body to other. The changes remains with the bodies and so the electricity is called static electricity. As they become oppositely charged they get a tendency to attract each other. Dat is why, a plastic comb attract piece of paper when rubbed in dry hair