(III) A toroid is a solenoid in the shape of a donut (Fig.

Chapter 20, Problem 49P

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(III) A toroid is a solenoid in the shape of a donut (Fig. 20–60). Use Ampère’s law along the circular paths, shown dashed in Fig. 20–60a, to determine that the magnetic field () inside the toroid is B = \(\mu_{a} N I \backslash 2 \pi R\), 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?

Equation transcription:

Text transcription:

mu{a} N I \backslash 2 pi R

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