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It is the opposition offered by the material of the flux.
Reluctance α mean length of flux path and reluctance α 1/cross section A
Reluctance=1/μ0μrA
Here μ0 and μr are the permeability of free space and relative permeability of material respectively.
Permittivity of free space; electric constant; epsilon_0 The ratio of the electric displacement to the intensity of the electric field generating it in vacuum. This is equal to
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