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Chapter 22 | Magnetism 975
22 MAGNETISM
Figure 22.1 The magnificent spectacle of the Aurora Borealis, or northern lights, glows in the northern sky above Bear Lake near Eielson Air Force Base, Alaska. Shaped by the Earth’s magnetic field, this light is produced by radiation spewed from solar storms. (credit: Senior Airman Joshua Strang, via Flickr)
Chapter Outline
22.1. Magnets
22.2. Ferromagnets and Electromagnets
22.3. Magnetic Fields and Magnetic Field Lines
22.4. Magnetic Field Strength: Force on a Moving Charge in a Magnetic Field 22.5. Force on a Moving Charge in a Magnetic Field: Examples and Applications 22.6. The Hall Effect
22.7. Magnetic Force on a Current-Carrying Conductor
22.8. Torque on a Current Loop: Motors and Meters
22.9. Magnetic Fields Produced by Currents: Ampere’s Law
22.10. Magnetic Force between Two Parallel Conductors
22.11. More Applications of Magnetism
Connection for AP® Courses
Magnetism plays a major role in your everyday life. All electric motors, with uses as diverse as powering refrigerators, starting cars, and moving elevators, contain magnets. Magnetic resonance imaging (MRI) has become an important diagnostic tool in the field of medicine, and the use of magnetism to explore brain activity is a subject of contemporary research and development. Other applications of magnetism include computer memory, levitation of high-speed trains, the aurora borealis, and, of course, the first important historical use of magnetism: navigation. You will find all of these applications of magnetism linked by a small number of underlying principles.
In this chapter, you will learn that both the internal properties of an object and the movement of charged particles can generate a magnetic field, and you will learn why all magnetic fields have a north and south pole. You will also learn how magnetic fields exert forces on objects, resulting in the magnetic alignment that makes a compass work. You will learn how we use this principle to weigh the smallest of subatomic particles with precision and contain superheated plasma to facilitate nuclear fusion.
Big Idea 1 Objects and systems have properties such as mass and charge. Systems may have internal structure.
Enduring Understanding 1.E Materials have many macroscopic properties that result from the arrangement and interactions of
the atoms and molecules that make up the material.
Essential Knowledge 1.E.5 Matter has a property called magnetic permeability.