The force between two poles is proportional to: the inverse of the pole strengths, the distance between the poles, the inverse of the distance between the poles, the inverse square of the distance between the poles

The force between two poles is given by the formula:
F=mi*q1*q2/4*pi*r
where 
F is force in newtons
q1 and q2 are magnitudes of the two poles
mi is the permeability of the medium
r is the distance between the poles
According to this formula the following statement is true:
The force between two poles is proportional to the inverse square of the distance between the poles.

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