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In the space of 5 x 5 x 2 cm3 how would you form an inductor...

In the space of 5 x 5 x 2 cm3 how would you form an inductor based on toroid geometry? Show all calculations and draw figures to justify. If half of the core of inductor is filled with some iron core of relative permeability of 4000, what will be the difference of stored energy for 2A current?

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