Learning Objectives By the end of this section, you will be able to: Because charges ordinarily cannot escape a conductor, the magnetic force on charges moving in a conductor is transmitted to the conductor itself. Figure 22.29 The magnetic field exerts a…
Learning Objectives By the end of this section, you will be able to: We have seen effects of a magnetic field on free-moving charges. The magnetic field also affects charges moving in a conductor. One result is the Hall effect,…
Learning Objectives By the end of this section, you will be able to: Magnetic force can cause a charged particle to move in a circular or spiral path. Cosmic rays are energetic charged particles in outer space, some of which…
Learning Objectives By the end of this section, you will be able to: What is the mechanism by which one magnet exerts a force on another? The answer is related to the fact that all magnetism is caused by current,…
Learning Objectives By the end of this section, you will be able to: Einstein is said to have been fascinated by a compass as a child, perhaps musing on how the needle felt a force without direct physical contact. His…
Learning Objectives By the end of this section, you will be able to: Ferromagnets Only certain materials, such as iron, cobalt, nickel, and gadolinium, exhibit strong magnetic effects. Such materials are called ferromagnetic, after the Latin word for iron, ferrum. A group…
Learning Objectives By the end of this section, you will be able to: Figure 22.3 Magnets come in various shapes, sizes, and strengths. All have both a north pole and a south pole. There is never an isolated pole (a monopole). All…
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.…
19.1 Hypersensitivities 19.2 Autoimmune Disorders 19.3 Organ Transplantation and Rejection 19.4 Immunodeficiency 19.5 Cancer Immunobiology and Immunotherapy
Learning Objectives By the end of this section, you will be able to: Cancer involves a loss of the ability of cells to control their cell cycle, the stages each eukaryotic cell goes through as it grows and then divides. When…