Example 22.8 The Magnetic Field Created by a Toroid Problem A device called a to

Question

Example 22.8 The Magnetic Field Created by a Toroid ProblemA device called a toroid (Fig. 22.33) is often used to create an almost uniform magnetic field in some enclosed area. The device consists of a conducting wire wrapped around a ring (a torus) made of a nonconducting material. For a toroid havingNclosely spaced turns of wire and air in the torus, calculate the magnetic field in the region occupied by the torus, a distancerfrom the center.

StrategyTo calculate the field inside the toroid, we evaluate the line integral of

Explanation / Answer

divide the 2 pi r B = u0 N I/(2 pi r)

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