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Reluctance

Opposition to the establishment of Magnetic Flux.

Reluctance is the property of a material which opposes the establishment of magntic flux in it. Reluctance is analogous to the resistance of the conducting material which opposes the flow to current through it. Simply reluctance is the resistance offered to the passage of magnetic flux through a material. The Reluctance of the a material is given by

Reluctance of magnetic circuit

The reluctance of any portion of a magnetic circuit is proportional to the length of the flux path, and inversely proportional to the area of cross-section of the path and inversely proportional to the permeability of the magnetic material. Thus reluctance of the magnetic circuit is given by

  • l = mean length of magnetic circuit in meter.
  • μo = Absolute permeability of air = 4 x 10-7 Henry/meter.
  • μr = Relative permeability of the magnetic material.
  • A = Area of cross section of the magnetic circuit.

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