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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.
The power factor of an a.c. circuit is 0.5. What will be the phase difference among voltage and current in this circuit?
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