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Statement of a problem № 2911

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A 2000-loop solenoid is wound uniformly on a long rod with length d and cross-section The relative permeability of the iron is km. On top of this is wound a 50-loop coil which is used as a secondary. Find the mutual inductance of the system.

Solution:
A 2000-loop solenoid is wound uniformly on a long rod with length d and cross-se

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