Chapter 32 Electrostatics

1.

1 point

If an atom has lost one or more electrons, it is a _____________ ion.

negative

positive

2.

1 point

If an atom has lost at least one proton, the atom is a ___________ ion.

negative

positive

3.

1 point

The net charge of an atom is

zero if the atom is electrically neutral

zero

number of protons and neutrons

number of protons

4.

1 point

As a pair of charges are brought closer together, the amount of force between them

decreases only if the charges are of opposite signs

increases only if the charges are of opposite signs

increases

decreases

5.

1 point

Materials through which electric charge can flow are called

insulators

conductors

6.

1 point

What is the SI unit of charge?

newton, N

starner, S

coulomb, C

neutron, Ne

7.

1 point

The primary purpose of a lightning rod is to

decrease the energy of lightning

attract lightning strokes

prevent lightning strokes

8.

1 point

The proportionality constant k in Coulomb's law is huge in ordinary units, whereas the proportionality constant G in Newton's law of gravitation is tiny. What does this mean in terms of the relative strengths of these two forces?

electrical force is generally much less

electrical force is generally much greater

9.

1 point

The predominant carrier of charge in copper wire is the

neutron

proton

ion

electron

10.

1 point

Unlike Newton's law of gravity, Coulomb's law involves

a fundamental physics law

the inverse- square law

a proportionality constant

repulsive as well as attractive forces

11.

1 point

If a cloud is negatively charged on its bottom and equally positive on its top, the net charge on the cloud is

negative

zero

positive

12.

1 point

When you scuff electrons off a rug with your shoes, your shoes are then

no charge

positively charged

negatively charged

13.

1 point

When you brush your hair and scrape electrons from your hair, your hair

becomes bananas

becomes positively charged

becomes negatively charged

no charge

14.

1 point

Which of these has the least inertia?

ions

protons

electrons

neutrons

15.

1 point

What are the three ways to charge an object? (neglecting the possible charge by polarization)

16.

1 point

If electrons are rubbed from cat's fur onto a rubber rod, does the rod become positively or negatively charged?

negatively

positively

17.

1 point

According to Coulomb's law, a pair of charged particles that are placed twice as close to each other will experience forces

twice as strong

the same

four times as strong

18.

1 point

What is the conservation of charge?

19.

1 point

Induction is the charging of an object without...

direct contact

candy

not touching it

20.

1 point

How is Coulomb's law similar to Newton's law of gravitation?

gravity

physics

both involve attracting and repelling forces

both are inverse square laws

21.

1 point

The net charge of a dipole is

normally zero

5

negative

positive