Magnetic reluctance is a measure of how easily a material can be magnetized or how difficult it is for magnetic lines of force (magnetic flux) to pass through a magnetic circuit. It is analogous to electrical resistance in electrical circuits. While electrical resistance opposes the flow of electric current, magnetic reluctance opposes the flow of magnetic flux.
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The magnetic reluctance of a linear section of magnetic circuit is the ratio of the winding's integrated magnetic field intensity to the magnetic flux, with units . For uniform length , cross-sectional area , and relative magnetic permeability , . Series sections carrying the same magnetic flux have additive magnetic reluctances, and .