Question: An ideal toroid has N turns and self-inductance L. A single turn of wire is wrapped around the toroid [see part (a) of the figure].

An ideal toroid has N turns and self-inductance L. A single turn of wire is wrapped around the toroid [see part (a) of the figure].

(a) What is the mutual inductance between the toroid and the single turn of wire?
(b) What would the mutual inductance be if the turn of wire had an area twice as large as the cross-sectional area of the toroid [see part (b) of the figure]?

Loop area 24 09 Toroid Toroid Cross-sectional area A

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