Magnetism and electricity are closely related. One can be generated from the other and both have many applications. This chapter will discuss magnetism and its applications, as well as how to calculate and measure the strength of magnetic fields (Figure 14.1).
FIGURE 14.1 The earth’s magnetic field protecting the earth from the solar wind.
Materials are magnetic because of the way the electrons in materials interact with one another. Atoms have nuclei made of protons and neutrons and “orbiting” the nuclei are electrons. Electrons themselves act like little magnets because of a property called spin. Two electrons with spins ...
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