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[Force index]
Force index
Value for the force of attraction exerted by a magnet on a ferromagnetic object at a particular distance
The strength of the attraction is determined by the extent to which a magnetic field is ‘inhomogeneous’. The force index is calculated by multiplying the local flux density in a particular direction by the amount of change of flux density per unit of length in that direction.
That is: Force index = flux density * (change of flux density per unit of distance).
As a formula: FI = B (ΔB/Δx)
The following video (in English) explains things further:
What is important when it comes to a magnet attracting a part?