Answer the question example 8.1 sequence of the displacement current b
time- dependent electric and magnetic fields to
, Faraday's law or electromagnetic induction and
More give a quantitative expression Of this statement, the current
the total current, as in Eq. (8.5). one very important consequence
symmetry is the existence Of electromagnetic waves. which we
(8.5)
_g MAXWELL'S FOUATIONS
Ites.
ient
1. fE.dA=Q/eo
ent
O. fB.dA=O
3. (fE.d1=
dt
It.
4. go ic+ßo
dt
(Gauss's Law for electricity)
(Gauss's Law for magnetism)
(Faraday's Law)
(Ampere — Maxwell Law)
ple 8.1 A parallel plate capacitor with circular plates of radius
m has a capacitance of 1 nF. At t = O, it is connected for charging in
eries With a resistor R = 1 MQ across a 2V battery (Fig. 8.3). Calculate
e magnetic field at a point P, halfway between the centre and the
eriphery of the plates, after t = s. (The charge on the capacitor
t time t is q (t) = CV II — exp (—t/r)l, where the time constant t iS
ual to CR)
op = 0.5m
IMQ
regards