After introducing the concepts of inductance,
let us see what kind of situation we have.
What are the laws that we have that learnt
so far.
Before Maxwell came into the field of Electromagnetism
and transformed it in a different transformed
it into something else, let us see what we
have learnt about the Laws of electromagnetism
.
So far, we have learnt that the divergence
of an electric field is given as rho over
epsilon naught, this is called the Gauss law
. The second thing that we have learnt is
the diversions of a magnetic field B , that
is always 0 and there is no name to this law
.
The third thing that we just learnt in the
context of induction was the curl of the electric
field is not always 0, if there is the time
varying magnetic field, the curl of electric
field is minus del B del t . This is the Faraday's
law 
and the last one is the curl of a magnetic
field .
This one is mu naught times the volume current
density this is known as the Ampere's law
. 
This is something we have learnt so far in
the context of electromagnetism.
And now we will look into this equation, the
last one and try to see whether this is valid
in every context or there are anomalies with
this equation .
