Define the term reluctance as used in magnetism
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Reluctance is a measure of the resistance of a magnetic material to the flow of magnetic flux. It is defined as the ratio of the magnetic reluctance of a material to the magnetic permeability of free space. Reluctance is typically denoted by the symbol R and is a dimensionless quantity.
R = \frac{l}{\mu_0 A}
Where l is the length of the magnetic path in the material, A is the cross-sectional area of the magnetic path, and μ0 is the magnetic permeability of free space.