i.e., the mutual inductance can be defined as the ratio of the total flux linkage of the second circuit to the current flowing in the first circuit.

As we have already stated, the magnetic flux produced in C₁ gets linked to itself and if C₁ has N₁ turns then , where is the flux linkage per turn.

Therefore, self inductance

  =       ...................................(4.52) 

As some of the flux produced by I₁ links only to C₁ & not C₂.

                      ...................................(4.53)

Further in general, in a linear medium, and