2 shows the electric
and magnetic fields inside the parallel plate capacitor discussed above The generalisation made by Maxwell then is the following The source
of a magnetic field is not just the conduction electric current due to flowing
FIGURE 8 1 A
parallel plate
capacitor C, as part of
a circuit through
which a time
dependent current
i (t) flows,  (a) a loop of
radius r, to determine
magnetic field at a
point P on the loop;
(b) a pot-shaped
surface passing
through the interior
between the capacitor
plates with the loop
shown in (a) as its
rim; (c) a tiffin-
shaped surface with
the circular loop as
its rim and a flat
circular bottom S
between the capacitor
plates