This note contains ideas and concepts on electrostatics from one of the best books on electrostatics namely "Introduction to Electrodynamics" by the very famous and great author D. J. Griffith.
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) Eleetvie ield
Source choarges 4,,%,93, .
Test chorrge : a
*Principle of supert poAltion F F
are s
mteracfton btw. two alhongès
are
completel unoalfecled by h e preenee of oerd
but an
not a logieal nec e s i t ,
Cuperumental JactE 1f holds, a F ;
are Atadionary.
Elec-los tatias - all Aowrce charrges
move
though test ohange nay
1-2) Couulom bs laue!
4 2
F
4TtE
. permitivity of free space ( N m
bo &54 x 10-7 a Nm2
1:3 Fleatvi Fie ld
F F6
42
4TE 47tb
A
4
44 TtE
A
471é
* Man well fhought that eleetrie omd magnette
Hields are Hhe 6tres nd +rasn 1n a jouy&ke
medi' em-'etHher', But latert op- relativity
abomdoned ths tdea.
,1.4) Oonti'nuns Chage Ds-Iributlon!
tor om 00n tinuuous oharrge dutri buHon
P(F)
471E.
*dq adl o da'
LD. 5. D
pdy
V.D
(F) 2()d
o(T) daa
4 TiEo
4T,
w o t a a0tamt wmt vector. t s
diree-tion dependy on ne AOUTtCe
ahatge
poAIHOn
v e r g ence Omd Cutl ot elec-trostotie dield
2.1) Field ines_Fluu omd Gyauss lao
Fjeld unes-
i) 3tards rom poAitive ohorcge omd ertmu nataes
at e gp*ive
N cbhozge
1) Dm ot erumu ma te mudau udaw &-ectte
i s 0 , wen E 0 (whicka can not
wwles thes a 1Ae heste
hoppe
not imter Aeot with each
iil) aam
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d irea -dion. of . At intersee tion pt
the
twill be two d1yec-hon Jor Aome .
thesre
, F l u n of weouah +Hhe swtJate 35
Pe =Fda. um berr of ield unes
twrough 3
i) twws quuoli-lodive
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i+ uch wad
Ho e nuumber
i) 4his u x YopoyHiorual
w ot egual
oof field Jines twrough 3,
u inAnty
to.(Thats ww
wh -total ield 'nes
inite value
out ave a
doce he
Jluw wouan
The om pwt swttace
side (-the
meosute of h e chatge
losed swtaee)
rate
positive changes nai de oill eme
1)i erHhet tetmu nates at
ie ld linies shieh sUt face
will he
-ve ahorrae
to Hhe Im t
outaide will enercate Jie ld
i) norae till atOM he alose d
ch
nesA arcoMed
keeping unes
Artace
twoHmes
to 2esrO
Hhe Wtfacee
h t t a0naLLs1On Cyauuss Lous
Ths
#auon-lifive ly
fov omy alosed Awttace
having fotal anartga 9
Imlde
*For spherree F da (ine dodp
Ve
As Jield goes Joy omd sLirC.IaCe 2e3
tLue me yesult is - rae
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