Magnetism and Ampère's law is a common subject in most calculus-based introductory physics courses. Many textbooks offer examples to calculate the magnetic field produced by a symmetric current by using Ampère's law.1 These examples include the solenoid and the toroidal solenoid (sometimes called a torus; see Fig. 1), which are used in many applications, including the study of plasmas.

1.
Serway and Jewett, Principles of Physics, 4th ed. (Brooks/Cole-Thomson Learning, 2006), pp. 749–52; Halliday, Resnick, and Walker, Fundamentals of Physics, 5th ed. (Wiley, New York, 1997), pp. 739–740; Tipler and Mosca, Physics for Scientists and Engineers, 5th ed. (W.H. Freeman and Company, 2004), pp. 872–873.
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