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, in attracted a negatively charged object

B

Explanation:

The comb had a net charge on it, and it attracted a neutral object. When a comb is rub with hair, the comb becomes charged. because the comb had acquired excess static charge, it could pick up bits of paper, which were uncharged. On the whole, the comb had a net charge on it, and it attracted a neutral object

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2