In a classroom experiment, a student rubs a comb against her hair. The comb is then brought near bits of paper resting on a surface. Which of these can be concluded if the comb picks up the bits of paper?
The comb is an insulator, but paper conducts electricity.
The comb had a net charge on it, and it attracted a neutral object.
The comb was left uncharged, and it attracted a positively charged object.
The comb was positively charged, and it attracted a negatively charged object.
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