Physics Chapter 5 pdf

Electricity, Magnetism, and Electromagnetism

1. The smallest unit of electrical charge is the __________.

a. electron

b. proton

c. neutron

d. neutrino

a. electron

The smallest unit of electrical charge is the electron.

2. Electrification occurs through the movement of ___________.

a. protons only

b. protons and electrons

c. electrons only

d. electrons and neutrons

c. electrons only

Electrification occurs only through the movement of electrons

3. Like charges _______ and unlike charges _______.

a. repel; repel

b. attract; attract

c. attract; repel

d. repel; attract

d. repel; attract

Like charges repel and unlike charges attract.

4. Electrostatic force is _________ proportional to the distance between charges, and _______ proportional to the product of the

charges.

a. directly; inversely

b. inversely; directly

c. inversely; inversely

d. directly; directly

b. inversely; directly

Electrostatic force is inversely proportional to the distance between charges, and directly proportional to the product of the charges

5. The charges on an electrified object are distributed __________.

a. in the center of the object

b. on the side nearest the charge

c. on the topside of the object

d. evenly throughout the object

d. evenly throughout the object

The charges on an electrified object are distributed evenly throughout.

6. On the surface of an electrified object, the charges concentrate on the __________.

a. top side

b. underside

c. sharpest curvatures

d. smoothest curvatures

d. smoothest curvatures

On the surface of an electrified object, the charges concentrate on the sharpest curvature.

7. A _________ is a source of direct current.

a. wall socket

b. battery

c. generator

d. spark

b. battery

A battery is a source of direct current.

8. What is the unit of electric potential?

a. Watt

b. Amp

c. Volt

d. Ohm

c. Volt

The unit of electric potential is the volt.

9. An electric potential applied to a conductor produces a(n)__________.

a. electric current

b. magnetic field

c. electric insulator and conductor

d. electric current and a magnetic field

d. electric current and a magnetic field

When an electric potential is applied to a conductor, both an electric current and a magnetic field are produced.

10. An alternating (AC) current is represented by a __________ line.

a. sinusoidal

b. horizontal

c. vertical

d. descending

a. sinusoidal

An alternating (AC) current is represented by a sinusoidal line.

11. A ___________ uses direct current.

a. hair dryer

b. toaster

c. microwave

d. flashlight

d. flashlight

A flashlight is battery operated, and batteries use direct current.

12. Alternating current is produced by a ___________.

a. battery

b. generator

c. capacitor

d. semiconductor

b. generator

Alternating current is produced by a generator.

13. What is Ohm’s law?

a. I = V/R

b. V = I/R

c. R = VI

d. I = VR

a. I = V/R

Ohm’s law is I = V/R.

14. A charged particle in motion creates a(n) ______________.

a. negative charge

b. positive charge

c. magnetic field

d. electrostatic charge

c. magnetic field

A charged particle in motion creates a magnetic field.

15. Electrical power is measured in _____.

a. coulombs

b. amperes

c. volts

d. watts

d. watts

Electrical power is measured in watts.

16. Rubber and glass are ___________.

a. semiconductors

b. conductors

c. insulators

d. superconductors

c. insulators

Rubber and glass are insulators because they are nonconductors.

17. The rotation of electrons on their axis is the property called ____________.

a. magnetic force

b. electron spin

c. unified field theory

d. magnetic induction

b. electron spin

The rotation of electrons on their axis is the property called electron spin.

18. When a group of dipoles are aligned, they create _________________.

a. a magnetic domain

b. paramagnetic material

c. magnetic resonance

d. a north pole

a. a magnetic domain

When a group of dipoles are aligned, they create a magnetic domain.

19. In the United States, alternating current goes through a complete cycle every _____ second.

a. 1/120

b. 1/100

c. 1/60

d. 1/30

c. 1/60

In the United States, alternating current goes through a complete cycle every 1/60 second.

20. What is the SI unit of magnetic field strength?

a. Ampere

b. Tesla

c. Dipole

d. Ohm

b. Tesla

The SI unit of magnetic field strength is the tesla or gauss.