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Consider the toroid. What direction does the magnetic field travel inside the toroid?

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Figure 12.22 (a) A toroid is a coil wound into a donut-shaped object. (b) A loosely wound toroid
does not have cylindrical symmetry. (c) In a tightly wound toroid, cylindrical symmetry is a very
good approximation. (d) Several paths of integration for Ampère's law.

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