Chapter 18 CYU 1

How many types of electric charge exist?

• one type

• two types

• three types

• four types

Which are the two many electrical classifications of materials based on how easily charges can move through them?

• conductor and insulator

• semiconductor and insulator

• conductor and superconductor

• conductor and semiconductor

True or false - A polarized material must have a nonzero net electric charge.

• True

• False

Describe the force between two positive point charges that interact.

• The force is attractive and acts along the line joining the two point charges.

• The force is attractive and acts tangential to the line joining the two point charges.

• The force is repulsive and acts along the line joining the two point charges.

• The force is repulsive and acts tangential to the line joining the two point charges.

How does a conductor differ from an insulator?

• Electric charges move easily in an insulator but not in a conducting material.

• Electric charges move easily in a conductor but not in an insulator.

• A conductor has a large number of electrons.

• More charges are in an insulator than in a conductor.

True or false—Charging an object by polarization requires touching it with an object carrying excess charge.

• True

• False