Final answer:
A student will observe that a comb run through hair will attract small pieces of paper due to static electricity. Dry air facilitates electrostatic effects more than moist air, and torn paper provides more points for electric attraction compared to cut paper.
Step-by-step explanation:
When a student runs a comb through their hair several times and then brings it close to small pieces of paper, they will observe that the small pieces of paper are attracted to the comb. In the context of electrostatics and humidity it's easier to get electrostatic effects in dry air because water molecules in the air can dissipate the electric charges. Torn paper might be more attractive to the comb than cut paper because the rough edges of torn paper provide more points for the electric charges to act upon, making the attraction stronger.