What is meant by magnetic reluctance? Derive an expression for the reluctance of a composite magnetic circuit consisting of an iron core and an air gap. Clearly state the assumptions made.
Magnetic reluctance is the opposition offered by a magnetic circuit to the establishment of magnetic flux in it. It is analogous to electrical resistance in an electric circuit and depends on the geometry of the magnetic path and the magnetic permeability of the material. It is defined as the ratio of magnetomotive force to the magnetic flux produced, and is expressed in ampere-turns per weber. Consider a composite magnetic circuit consisting of an iron core with a uniform cross-sectional area (A) _________ ____ __________ ________ ________ _______ _____ ____ __________ _____.
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