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Byju's Answer
Standard XII
Physics
Flux as the Flow
Intensity of ...
Question
Intensity of electric field due to an electric dipole in co-axial position? explain
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Solution
Suppose
there
is
a
system
of
charges
-
q
(
at
A
)
and
+
q
(
at
B
)
separated
by
a
distance
2
a
.
Let
P
be
any
point
on
an
axis
where
the
field
intensity
is
to
determined
.
Electric
field
at
P
due
to
+
q
E
=
1
4
π
∈
0
q
(
BP
)
2
along
BP
=
1
4
π
∈
0
q
(
r
-
a
)
2
Electric
field
at
P
due
to
-
q
E
'
=
1
4
π
∈
0
q
(
AP
)
2
along
PA
=
1
4
π
∈
0
q
(
r
+
a
)
2
Net
field
at
P
will
be
given
by
,
E
P
=
E
-
E
'
=
1
4
π
∈
0
q
(
r
-
a
)
2
-
1
4
π
∈
0
q
(
r
+
a
)
2
=
q
4
π
∈
0
[
1
(
r
-
a
)
2
-
1
(
r
+
a
)
2
]
=
2
qa
4
π
∈
0
2
r
(
r
2
-
a
2
)
2
Now
,
2
qa
=
p
,
k
=
1
4
π
∈
0
E
P
=
2
kpr
(
r
2
-
a
2
)
2
along
BP
Suggest Corrections
1
Similar questions
Q.
Obtain an expression for intensity of electric field at a point in end on position, i.e., axial position of an electric dipole.
Q.
Derive an expression for electric field intensity due to an electric dipole at a point on its axial line.
Q.
If the intensity of electric field at a distance
x
from the centre in axial position of small electric dipole is equal to the intensity at a distance
y
in equatorial position, then
Q.
Write an expression (derivation not required) for intensity of electric field of an electric dipole, in terms of its length
(
2
a
)
, dipole moment
(
p
)
and distance
(
r
)
for:
(
1
)
Axial position.
(
2
)
Broad side position.
Q.
(i) Write an expression (derivation not required) for intensity of electric field in:
(1) Axial position.
(2) Broad side position of an electric dipole, in terms of its length (2a) dipole
moment (p) and distance (r).
(ii) What is the ratio of these two intensities i.e. E1 : E2, for a short electric dipole?
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