3 fiches d’electromagnetisme avec les notions les plus importantes du cour.
- conservation de l’energie
- demonstration
-onde dans le vide
-jauge de lorentz
-pression de radiation
-conductivite d’un plasma
-relation constitutive
fiches électromagnétisme
I =D dis j' Eq Maxwell
-
=
Sj ÏÈ ÏÏ -0
Sir est la conductivité E- ( loi d' Ohm )
-
¥ -
r JE -
AI
ne
e-
zt .
nI-pji-E.pro ¥
-
J'
-
Conservation l'
de
énergie .
TÏÎIJË È
Épics m's
"
ftp.t + =
0 avc -
)
RTE ) Rappel calcul
4- Être
-
B
- coordonnées
cylindriques )
démo :
j' Ë -
_
ftp.TEB-E.IE ) :C =
f-ËIJIB
) -
EË -
Ê -
invariance ( ex Bletê
# IEEËZ ) courant
si il a un
y
= -
=ËŒ JFËË¥lEàÈ ) →
Eq maxwell
= -
¥1
+
¥8 ) ËË ) Ampère : fois .de?mdEI )
à )
TE)
( le + sonnent rao
EËT Fi
¥17
-
=
-
contour d' Ampère
ondes EM :
f-0 etje donc
0¥ e-
°
îgnô =
-
ê .
leê ) -2 -
Conservation du courant :
ff+8 j' .
=
0
cas > ëz Lena ? -
-
o
" " mi =
dos " > E
ai
Ondes
électromagnétiques dans le vide
since
paussi
onde
plane :
IËB:{ În
avc Titi - °
vitesse de
'"
phase :
în et m' sont les directions de l' onde
E '
9k :
"
propagation de
utesse de
groupe =
:{ Ê
dans le cède l' enveloppe
Ondes planes TE tient n' terse de
d' une onde
q
Oojddw
:
Maxwell :
IËÊËÇÏËË d- À
#IÉNÈP .
relation dispersion
unité
:
Œ= KÉ -
et
ËË -
nie Ê=ÊBpk Eisner -
_
laplacien
È +
KYÉ -
O alors week
D=
Eût ÊTÊ
" 'T d' Alembert
.in
périodicité temporelle :
F- ¥ ; périodicité spaàale : 7-
¥Ë¥→
=
çz÷
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