The toroid is a coil of wire wrapped around a doughnut-shaped ring made of nonconducting material. 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. Use Ampere's law to find an expression for the magnetic field strength at a distance r from the axis of a toroid with N closely spaced turns carrying current I. c. Is a toroidal magnetic field a uniform field? Explain.

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