When the flux FB through the coil changes, each turn
contributes to the induced emf Therefore, a term called flux linkage is
used which is equal to NFB for a closely wound coil and in such a case
NFB∝  I
The constant of proportionality, in this relation, is called inductance We shall see that inductance depends only on the geometry of the coil
and intrinsic material properties This aspect is akin to capacitance which
for a parallel plate capacitor depends on the plate area and plate separation
(geometry) and the dielectric constant K of the intervening medium
(intrinsic material property)