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What is the unit of reluctance in magnetic materials?

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What is the unit of reluctance in magnetic materials?

(a) Henry/m

(b) Weber/m^2

(c) Ampere-turns/Weber

(d) Ampere-turns/m

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Asked question is from Magnetic Materials topic in section Electrical Engineering Materials of Design of Electrical Machines

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The correct choice is (c) Ampere-turns/Weber

The explanation is: Henry/m deals with the unit of permeability. Weber/m^2 deals with the unit of magnetic field.  Reluctance is the opposite of permeance.

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