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.
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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please show all starting equations and derivations
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