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Relative Permeability

The force of attraction or repulsion between the two poles of strengths m1 and m2 webers placed d metres apart in any medium of relative permeability μr is given by

Fmedium =  m1m2  

If the same pole i.e. of strength m1 and m2 are placed in air medium at the same distance i.e. d metres apart then force acting between hem is given by,

 Fair = m1m2
Dividing expression (iv) by expression (iii) we get
  Fair      =   4πμod2
Fmedium     m1m2

Hence relative permeability of the medium (μr ) is defined as the ratio of the force between two magnetic placed at a certain distance in air to the force between them placed at the same distance in the medium.

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