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?
a)
the comb is an insulator, but paper conducts electricity.
b)
the comb had a net charge on it, and it attracted a neutral object.
c)
the comb was left uncharged, and it attracted a positively charged object.
d)
the comb was positively charged, and it attracted a negatively charged object.