A toroid is a solenoid in the shape of a circle (Fig. 20-62). Use Ampere€™s law along the circular path, shown dashed in fig, 20-62a, to determine that the magnetic field.
(a) Inside the toroid is B = μ0 NI/2πR, where N is the total number of turns, and.
(b) Outside the toroid is B = 0.
(c) Is the field inside a toroid uniform like a solenoid€™s? If not, How does it vary?

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Path 1 Path 2 (a) (b)