Electric dipole

&
Electric dipole mument
called unipole.
#1 .

Any isolated single charge is

It be or-g
.
can +g

#2 .
Electric dipole consist of two equal I

distance
opposite charges separated by SMALL .

as shown.

Here 2a

O O
Eq charge + q g
-

= on

dipole
not
2a = depole length .

(why za I ? a

⑪ convention]
#3 (a) What
.
is net
charge on dipols ?
= +q + ( q)
-

= Zero
.

(b) define
electric moment (P ,
P)

>
-
it is defined as
product of either

distance
charge
the dipole &
forming -

blo
(a)
them

>
-
p q(2a)=

>
-
unit coulomb-meter (C-m]
#- Vector - der"--re o the
charge
 have unit coulomb-
#4 .
Name the
gly that

neter .
Is it scalar or
rectory
>
-
electric dipols moment

>
- vector .

#5
. An a a
proton are separated by
moment
30cm .
End dipole .

2 te
P ?
-

=
[2a]g om-2a
= /30x182]/16x11a
= 4 .
8 x 1820 Cm
NCERT ,

#6 . Two charges
>
- + 216 at (0 ,
0
,
-15) am

>
-
-
2HC at 10,
0
,
+ 15cm)
Z
End
a) charge on system -
2HC
⑧
q = + 24c + ( -

2())
> Zero
+ 15cm
-
.

moment
electric dipole .
D

: P =
(2a)g + 15cm

=
(30x182](2x10y ⑧
= 6x107Cm . + 2HC
*
Oth ·q
#7 Psys

#
.
.

↑
d d d d
B =
qd
60
%
⑨
d
⑧ ⑨ S ⑳

·a
+q
-

2g +q
-

q -

Pret JP 122 2 p, B
" :

+ + cas60
· =

= J5gd .

#8. +q

d jgd

⑧ ⑧
d +g
-

29

Electric field intensity

#1 · How to measure
strength of a
field : -

P
O
-
⑦
B S S
.
. .
W
B SS. . .

TTH- > X

Add > X -
#I .
def .
of E .

field intensity :-
P
⑭ F
-

Source %
charge Test charge
by defi- re(convent
I
>+
-

ELimite >
% -0
-

#
=
% .
e . E .

field interity
at a
point is

defined
on a
as
of
testant a
foreacting
per unit test charge .

* Why g = + ve
?
>
-
convention
thata field of test
*
why so

charge .

small
② is quite
I will not affect field
of source
charge .
# But there will be some field of test

charge .
Emeasured Factual

-X
in

----
t
due to a
point charge
E
.

fuld

⑫No
F
=
Now,
by def I
E =
To

=Eort

#factors in vac

Eined-re
·:
Era,
* For conductor; Fied = o

·: Er =
* E .
field in vector form
E
=
=
Its dirn is
* E-field is a vector gty .
----

30PM
=>
-

:
8 45PM
-