4. A toroid has a major radius, R, much greater than the minor radius, r. It consists of tightly wound N turns of wire on a cardboard torus. Derive an expression for the inductance of this inductor.

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4. A toroid has a major radius, R, much greater than the minor
radius, r. It consists of tightly wound N turns of wire on a
cardboard torus. Derive an expression for the inductance of
'R
this inductor.
R
Transcribed Image Text:4. A toroid has a major radius, R, much greater than the minor radius, r. It consists of tightly wound N turns of wire on a cardboard torus. Derive an expression for the inductance of 'R this inductor. R
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