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Define reluctance and give its unit.

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The opposition to the flow of flux is called as reluctance. Reluctance is denoted by S. Reluctance is the resistance to magnetic flux.

The unit of reluctance is Ampere per Weber (A/Wb).
Mathematically reluctance is given by,
S= l/μa
Where, S = reluctance
l = length
μ = permeability
a = area

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