Question

13. A person walks across the carpet, rubbing their feet. Next, they touch the doorknob,
transferring electrons into the doorknob. Which statement demonstrates conduction?
a. Walking across the carpet
b. Touching the doorknob
c. No conduction was demonstrated.
14. An electrically charged metal rod touches a neutral metal ball. Which statement best
describes what will happen next.
a. The protons within the rod will be transferred into the metal ball and spread out evenly across
the metal ball.
b. The electrons within the rod will be transferred into the metal ball and stay in a central
location.
c. The protons within the rod will be transferred into the metal ball and stay in the central
location.
d. The electrons within the rod will be transferred into the metal ball and spread out evenly.

Answer 1

13. b — Touching the doorknob. Conduction is the transfer of charge by direct contact; the rubbing is triboelectric charging, the touch transfers electrons to the knob.

14. d — The electrons within the rod will be transferred into the metal ball and spread out evenly. In a metal only electrons move; after contact they redistribute over the conductors until equilibrium.