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A toroid with a rectangular cross-section has a radius of a and outer radius of b...

A toroid with a rectangular cross-section has a radius of a and outer radius of b and height of h with N turns of coil. Determine the:
a) Magnetic field inside the toroid as a function of distance/space s to the centre of the toroid.
b) Total energy stored inside the toroid if given current I.
c) Self-inductance of the toroid.

Answer with complete and clear narration, don't just write down equations and calculations.

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