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Byju's Answer
Standard XII
Physics
Electric Field
Draw a graph ...
Question
Draw a graph of E versus r for,
r
>
>
a
.
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Solution
Net field at P is given by
E
P
=
E
B
−
E
A
=
1
4
π
ϵ
0
(
q
(
r
−
a
)
2
−
q
(
r
+
a
)
2
)
=
q
4
π
ϵ
0
4
a
r
(
r
2
−
a
2
)
2
=
1
4
π
ϵ
0
2
p
r
(
r
2
−
a
2
)
2
along BP .
for r>>a
E
P
=
1
4
π
ϵ
0
2
p
r
3
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