Irodov – Problems in General Physics

29. The. Basic Formulas of Electrodynamics in the SI
    and Gaussian Systems

Name SI Gaussian system

Strength of the
field of a point
charge

Strength of the
field of a plane

Potential of the

field of a point

Relation between
E and y
Electric dipole p
in field E
Relation between

Relation between
a', P, and E
Definition^ of^ the
vector D
Relation between
a and x
Relation between

Gauss theorem for

the vector D

Capacitance of a

capacitor

Capacitance of a

plane capacitor

Energy of a sys-

tem of charges

Energy of a ca-

pacitor

Energy density of

electric field

Ohm's law

Joule's law

Magnetic moment

of a current car-

rying loop

Magnetic dipole

pm in the field B

E— 1 q

—(P2=

iv= _pE

gy

2 qi(Pi

CV 2 /2

1

aE 2

W = —

j=crE

E =- 4xrcr

43 - re, r 2

E = --^0

capacitor

808

1 q

a

q

r

2

.S Eici/ '

1

P= xE

Q' = 13 7i = xEn

D=E+43TP

e=1+4ax

D=8E

(1 DnelS=4aq

eS

charge

P and E

D and E

IT= (^43) - teo — r
E= — Vc1),^ ( P i
N=[pE],
P= xe 0 E
O f = Pn =xeoEn
D=e 0 E-FP
8=1+x
D =8 0 8E
§ DndS=q
C ---
C— EoaS^
d
W= 1 /2
W ----
w= ED
,C- 4ad
w—
= — 8
D
2
w=
pm = /S
N= [pm13],

• 37 1,

(^1) IS
Pm=7
pmB