The Relation between force between the two poles in free space and medium

Reason & Explanation:Force between the two poles in free space is Fa=μo4πmm2  1 r2 ----------(1)Force between the two poles in free space is  Fm=μ4πm1m2r2-----------(2)(2)/(1)  ⇒ FmFa=μμ0=μrMagnetic permeability of free spaceμ→  Magnetic permeability of mediumμr→ Relative permeability of medium