The force between two magnetic poles of strength m₁ and m₂ lying at a distance  is given by F=k.m₁m₂/r². In S.I. units  , 

(i) Magnetic field because of an imaginary magnetic pole (Pole strength m) : Is given by   

(b) On equatorial position;

(c) General position :  In general position for a short bar magnet ,

When a bar magnet is left open in a uniform magnetic field, if align itself in the directional field.

(i) Torque : t =

(ii) Work : W=MB(1-cosθ)

(iii) Potential energy :  (θ = Angle made by the dipole with the field)

Net magnetic flux through any surface is always zero i.e.    

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