The toroid of FIGURE P29.55 is a coil of wire wrapped
Chapter 29, Problem 29.93(choose chapter or problem)
The toroid of FIGURE P29.55 is a coil of wire wrapped around a doughnut-shaped ring (a torus). Toroidal magnetic fields are used to confine fusion plasmas. a. From symmetry, what must be the shape of the magnetic field in this toroid? Explain. b. Consider a toroid with N closely spaced turns carrying current I. Use Ampres law to find an expression for the magnetic field strength at a point inside the torus at distance r from the axis. c. Is a toroidal magnetic field a uniform field? Explain.
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